# TWITTER Bikes MT390 U4000-9S MTB Aluminum Alloy Mountain Bike – Independent Cycling Brand (No Affiliation with X Social Platform) TWITTER Bikes is an independent bicycle manufacturer and registered bicycle trademark. We are not affiliated with, endorsed by, sponsored by, or associated with X (formerly Twitter) or X Corp. ## **MT390 MTB, AL6061-T6 Mountain Bike** ● MTB, AL6061-T6 Inner cables Frame ● TW Alu alloy, Coil suspension, Manual-lockout ● CUES/U4000-9S CUES/U4000-2\*9S ● TEKTRO Hydraulic Disc, 160/160mm ![Twitter MT390 U4000-9S Aluminum MTB Mountain Bike](https://cdn.shopify.com/s/files/1/0798/5902/4057/files/Twitter-MT390-U4000-9S-MTB-Aluminum-Alloy-Mountain-Bike-D-01.webp?v=1784167834) ![Twitter MT390 U4000-9S Aluminum MTB Mountain Bike](https://cdn.shopify.com/s/files/1/0805/3103/0261/files/Twitter-MT390-U4000-9S-MTB-Aluminum-Alloy-Mountain-Bike-D-02.webp?v=1781328534) ## **Twitter MT390 U4000-9S MTB Aluminum Alloy Mountain Bike** ## **Suitable for use in multiple scenarios** **Twitter MT390 U4000-9S Road Bike** ● Relaxing and leisurely cycling ● Competitive Cycling ● Commuting to work by bike ![Twitter MT390 U4000-9S Aluminum MTB Mountain Bike](https://cdn.shopify.com/s/files/1/0805/3103/0261/files/Twitter-MT390-U4000-9S-MTB-Aluminum-Alloy-Mountain-Bike-D-03.webp?v=1781328534) ![Twitter MT390 U4000-9S Aluminum MTB Mountain Bike](https://cdn.shopify.com/s/files/1/0805/3103/0261/files/Twitter-MT390-U4000-9S-MTB-Aluminum-Alloy-Mountain-Bike-D-04.webp?v=1781328534) ## **CONQUER THE RUGGED** **Reshape the contours of the mountains and fields** Aluminum alloy mountain bike ● AL6061-T6, XC Frame ● Four configuration options Hydraulic disc brake ● MgAl alloy air suspension, remote ## **FRAME GEOMETRY DIAGRAM** ![Twitter MT390 U4000-9S Aluminum MTB Mountain Bike](https://cdn.shopify.com/s/files/1/0805/3103/0261/files/Twitter-MT390-U4000-9S-MTB-Aluminum-Alloy-Mountain-Bike-D-05.webp?v=1781328534) ![Twitter MT390 U4000-9S Aluminum MTB Mountain Bike](https://cdn.shopify.com/s/files/1/0805/3103/0261/files/Twitter-MT390-U4000-9S-MTB-Aluminum-Alloy-Mountain-Bike-D-06.webp?v=1781328534) ## **Easy to Control Steady Even on Gravel Roads** **Alu alloy, Handlebar** Lighter than steel frames, tougher than carbon frames it's not a compromise, it's purer control. Lightweight aluminum alloy: get 90% of the performance for half the budget. ● Corrosion-resistant ● High Rigidity ● Lightweight ## **MT390 AL6061-T6, XC, Thru-axle Frame** **Mountain / Flat Welding Putty / Internal Wiring** Aluminum aloy has good plasticity and ductility, low density, high strength, shock absorption, high load-bearing impact capacity, and good corrosion resistance to organic substances and alkalis. ● Lightweight ● High Strength ● Corrosion Resistant ● Cost-Effective ![Twitter MT390 U4000-9S Aluminum MTB Mountain Bike](https://cdn.shopify.com/s/files/1/0805/3103/0261/files/Twitter-MT390-U4000-9S-MTB-Aluminum-Alloy-Mountain-Bike-D-07.webp?v=1781328534) ![Twitter MT390 U4000-9S Aluminum MTB Mountain Bike](https://cdn.shopify.com/s/files/1/0805/3103/0261/files/Twitter-MT390-U4000-9S-MTB-Aluminum-Alloy-Mountain-Bike-D-08.webp?v=1781337736) ## **EASY TO USE AND DURABLE** **Alu Alloy, Coil Suspension Fork** The front fork balances efficiency on flat roads with comfort on rough terrain, while also being lightweight, durable, and easy to handle. It's a very cost-effective and practical setup for a mountain bike. ## **International Big Brand CUES/U4000-9S Gear Shift Kit** ![Twitter MT390 U4000-9S Aluminum MTB Mountain Bike](https://cdn.shopify.com/s/files/1/0805/3103/0261/files/Twitter-MT390-U4000-9S-MTB-Aluminum-Alloy-Mountain-Bike-D-09.webp?v=1781328534) **Impact-resistant, corrosion-resistant, ride freely.** ● Sun-resistant ● Corrosion-resistant ● Flat Welding ● High Load-bearing Capacity Sturdy and durable, worry-free maintenance kit. It does not pursue lightweight design or competitive-level shifting speed, but instead focuses on durability, smoothness, and compatibility. If you mainly use it for daily city commuting, weekend leisure rides, orlong-distance travel. ## **Flat Welding, Strong Lightweight Load-bearing** ![Twitter MT390 U4000-9S Aluminum MTB Mountain Bike](https://cdn.shopify.com/s/files/1/0805/3103/0261/files/Twitter-MT390-U4000-9S-MTB-Aluminum-Alloy-Mountain-Bike-D-10.webp?v=1781328534) ![Twitter MT390 U4000-9S Aluminum MTB Mountain Bike](https://cdn.shopify.com/s/files/1/0805/3103/0261/files/Twitter-MT390-U4000-9S-MTB-Aluminum-Alloy-Mountain-Bike-D-11.webp?v=1781328534) **AL6061-T6, XC Frame** The bike frame is heavy, carrying the bike is exhausting. ![Twitter MT390 U4000-9S Aluminum MTB Mountain Bike](https://cdn.shopify.com/s/files/1/0805/3103/0261/files/Twitter-MT390-U4000-9S-MTB-Aluminum-Alloy-Mountain-Bike-D-12.webp?v=1781328534) **Precise Frame Geometry Design** Road feel bumpy handling feels weak, enjoy the bike. ![Twitter MT390 U4000-9S Aluminum MTB Mountain Bike](https://cdn.shopify.com/s/files/1/0805/3103/0261/files/Twitter-MT390-U4000-9S-MTB-Aluminum-Alloy-Mountain-Bike-D-13.webp?v=1781328534) **Efficient and Reliable Brake System** Slamming the brakes on muddy roads, my heart panics. ## **Reliable Braking TEKTRO Hydraulic Disc** **Controlled as needed, responds in a flash!** ● Mountain trails ● Endurance riding ● City commuting The front fork is made of aluminum alloy, making it lighter. It reduces the overall weight of the bike, improves riding flexibility and handling, and also has good durability and corrosion resistance, providing reliable support. ● Sensitive to the touch ● Bike Safety ● Brake stability ![Twitter MT390 U4000-9S Aluminum MTB Mountain Bike](https://cdn.shopify.com/s/files/1/0805/3103/0261/files/Twitter-MT390-U4000-9S-MTB-Aluminum-Alloy-Mountain-Bike-D-14.webp?v=1781328534) ![Twitter MT390 U4000-9S Aluminum MTB Mountain Bike](https://cdn.shopify.com/s/files/1/0805/3103/0261/files/Twitter-MT390-U4000-9S-MTB-Aluminum-Alloy-Mountain-Bike-D-15.webp?v=1781337734) ## **29 (27.5)×2.1" Lightweight all-terrain tires** **Wear-resistant and Puncture-proof | Light and Easy for Cycling | Thoughtful Details** The 2.1-inch wider tire not only improves riding stability but also enhances the ability to handle complex terrain. It provides excellent grip on various surfaces like muddy roads, dry gravel, and slippery ground. ● Mountain bike durable tires, explosion-proof tread increases tire strength. ● Inner tube protective cushioning layer. ● Inner explosion-proof layer. ● The tire carcass is the main body of the tire. It's often used as a reference for TPI. The higher the TPI the more fibers there are. ● The bead is used to hold the inner tube in place, making the tire less likely to deform. ## ● CUES/U3020-9S Rear Derailleur ● CUES/U4000-9S Derailleur Lever ● SUMC-9S Chain ● Alu alloy, Square Axis 38T Cranksets ● SUGEK-9S, 11-36T Cassettes ![Twitter MT390 U4000-9S Aluminum MTB Mountain Bike](https://cdn.shopify.com/s/files/1/0805/3103/0261/files/Twitter-MT390-U4000-9S-MTB-Aluminum-Alloy-Mountain-Bike-D-16.webp?v=1781337734) ## **Twitter MT390 U4000-9S Aluminum Mountain Bike** Handelbar Sets, Clamps, Fork, Head Sets, Washer: Alu alloy ![Twitter MT390 U4000-9S Aluminum MTB Mountain Bike](https://cdn.shopify.com/s/files/1/0805/3103/0261/files/Twitter-MT390-U4000-9S-MTB-Aluminum-Alloy-Mountain-Bike-01.webp?v=1781328551) ![Twitter MT390 U4000-9S Aluminum MTB Mountain Bike](https://cdn.shopify.com/s/files/1/0805/3103/0261/files/Twitter-MT390-U4000-9S-MTB-Aluminum-Alloy-Mountain-Bike-02.webp?v=1781328551) ![Twitter MT390 U4000-9S Aluminum MTB Mountain Bike](https://cdn.shopify.com/s/files/1/0805/3103/0261/files/Twitter-MT390-U4000-9S-MTB-Aluminum-Alloy-Mountain-Bike-03.webp?v=1781328551) ![Twitter MT390 U4000-9S Aluminum MTB Mountain Bike](https://cdn.shopify.com/s/files/1/0805/3103/0261/files/Twitter-MT390-U4000-9S-MTB-Aluminum-Alloy-Mountain-Bike-04.webp?v=1781328551) ![Twitter MT390 U4000-9S Aluminum MTB Mountain Bike](https://cdn.shopify.com/s/files/1/0805/3103/0261/files/Twitter-MT390-U4000-9S-MTB-Aluminum-Alloy-Mountain-Bike-05.webp?v=1781328551) ![Twitter MT390 U4000-9S Aluminum MTB Mountain Bike](https://cdn.shopify.com/s/files/1/0805/3103/0261/files/Twitter-MT390-U4000-9S-MTB-Aluminum-Alloy-Mountain-Bike-06.webp?v=1781328551) ## **Technical** **Wheel Size** 700C **Frame Height** 29(27.5)×15" / 17" / 19" / 21" **Bike Color** White, Matte Black, Matte Titanium Gray **Net Weight** M315-24S: 13.6KG; RS-30S: 13.6KG; U4000-9S: 13.6KG; U4000-18S: 13.6KG **Frame** MT390, MTB, AL6061-T6, Smooth welding, Inner cables **Handelbar Sets** Alu alloy, Matte, Handlebar 31.8×720, Stem 60, Seat post 31.6×350mm **_Seat Post_** Alu alloy, 31.6×350mm **Clamps** Alu alloy, Quick release 34.9mm **Fork** TW Alu alloy, Coil suspension, Manual-lockout **Head Sets** Inner-Cables routing, Sealed bearings 52\*52mm **Washer** Alu alloy 3×28.6×10mm **Hubs** RS Alu alloy, 2-sealed Bearings, HG, Disc, 32/32Holes **Rim** RS Alu alloy, Double wall with rivets, W25×H21mm **Spoke** SHUNJIU,Circular 14G **Tyre** CST, 29(27.5)×2.1" **_Belt_** PU with Comfortable & Skid resistant **Saddle** Comfortable and Lightweight for MTB **Pedals** Alu alloy, Lightweight & Skid resistant **Cables** JAGWIRE, Internal cables, External cables **Accessories** Standard safety reflector for Handelbar + Seat post + Front wheel + Rear wheel PC Bottle cage + Tools + Rear kickstand Manual + Warranty card **BB** M315-24S: Hollow & Bearings, BSA68×24; RS-30S: Hollow & Bearings, BSA68×24; U4000-9S: Kenli, Sq axis, BSA68 & Bearings; U4000-18S: Hollow & Bearings, BSA68×24 **Brake** TEKTRO hydraulic disc, 160/160mm **Grips** Circular 22.2×120mm with Comfortable ## **ConfRev Compare** **Bike Specs** **M315-24S** **RS-30S** **U4000-9S** **U4000-18S** Derailleur Lever SHIMANO M315-3\*8S RETROSPEC(LTWOO)-3\*10S SHIMANO CUES/U4000-9S SHIMANO CUES/U4000-2\*9S Front Derailleur SHIMANO TY500 RETROSPEC(LTWOO)-3S None SHIMANO CUES/U4000-2S Rear Derailleur SHIMANO TY300 RETROSPEC(LTWOO)-10S SHIMANO CUES/U3020-9S SHIMANO CUES/U3020-9S Cranksets RS, Alu alloy, Hollow 24-32-42T RS, Alu alloy, Hollow 24-32-42T RS, Alu alloy, Square axis 38T RS, Alu alloy, Hollow 32-42T Cassettes SUGEK-8S, 11-32T SUGEK-10S, 11-36T SUGEK-9S, 11-36T SUGEK-9S, 11-36T Chain SUMC-8S SUMC-10S SUMC-9S SUMC-9S BB Hollow, & Bearings, BSA68×24 Hollow, & Bearings, BSA68×24 Kenli, Sq axis, BSA68, & Bearings Hollow, & Bearings, BSA68×24 Net Weight 13.6KG 13.6KG 13.6KG 13.6KG ## **Twitter Bike Size** Size A B C D E F G H I J K BB center to head of seat tube Effective head tube horizontal BB offset Chainstay length Seat angle Head angle Front center Head tube length Fork offset Reach Stack 43.5 43 500 72 410 74.5° 71° 562 110 45 360 506 46 460 517 72 410 74.5° 71° 577 120 45 376 510 48 480 535 69.5 410 74° 72.5° 579 125 45 387 517 50 500 541 69.5 410 74° 72.25° 589 130 45 390 528 52 520 561.6 67 410 73° 73° 592 140 45 395 545 54 540 573 67 410 73° 73° 604 150 45 402 562 ## **5 TYPES OF FRAME SIZES** Wheel Diameter Size 700 C 700 C 700 C 700 C 700 C 700 C Elevated Dimensions 43.5 cm (XXS) 46 cm (XS) 48 cm (S) 50 cm (M) 52 cm (L) 54 cm (XL) CUSTOM-MADE Match Height 155-165 cm 166-172 cm 168-175 cm 175-180 cm 180-185 cm 185-190 cm \* Because everyone's body shape is different, proportions vary, and there may be certain deviations during manual measurement. \* This size chart is for reference only. ## **Announcement from the exclusive distributor** We hereby announce that the Twitter MT390 U4000-9S is available for purchase exclusively on the official Twitter website. This means that Twitter is the sole authorized seller of this product in this region. Selling the Twitter MT390 U4000-9S on any other website or platform constitutes a violation of false advertising laws. We remind all consumers that only Twitter MT390 U4000-9S products sold on the official Twitter website are genuine. Do not be misled by other websites or sellers claiming to offer our product. Buyers who purchase from unauthorized sources may receive counterfeit products, incur additional costs or disappointments related to delivery delays, or receive products that do not meet specified standards. We have a team of experienced professionals dedicated to protecting our rights. Twitter reserves the right to take legal action in the event of any infringement of its exclusive sales and distribution rights. We encourage consumers to report any fraudulent activity or misleading information regarding the Twitter MT390 U4000-9S on any platform other than the official Twitter website. Thank you. ## **Features** Robust Aluminum Alloy Frame - Experience the perfect blend of strength and weight with the Twitter MT390 U4000-9S, featuring a robust AL6061-T6 aluminum alloy frame. This material ensures high durability while remaining lightweight, allowing for agile handling and superior performance on rugged terrains. Advanced Suspension System - Equipped with a coil suspension fork and manual-lockout feature, this mountain bike guarantees a comfortable ride over various terrains. The suspension system balances efficiency on smooth roads with absorption on rough trails, making every ride a pleasure. Hydraulic Disc Brakes for Safety - The TEKTRO Hydraulic Disc braking system provides reliable stopping power in all conditions. Whether you’re descending steep hills or navigating through mud, these brakes ensure you have the control you need for safe riding. Versatile Tire Design - Fitted with 29 (27.5)×2.1" all-terrain tires, the MT390 U4000-9S excels in stability and grip on diverse surfaces. The tires are designed to be wear-resistant and puncture-proof, giving you the confidence to conquer both rocky paths and city streets. Customizable Frame Sizes - Available in multiple frame sizes (15”, 17”, 19”, 21”), the Twitter MT390 U4000-9S is designed to accommodate riders of different heights. This tailored fit ensures optimal comfort and performance, enhancing your riding experience. Warranty and Free Shipping - Enjoy peace of mind with a 3-year warranty and 30 days return policy on your purchase. Plus, benefit from free shipping, ensuring your new mountain bike arrives at your doorstep without extra costs. ## **FAQs** What is the price of the Twitter MT390 U4000-9S mountain bike? - The Twitter MT390 U4000-9S mountain bike is priced at good. It's a great investment for those looking for a high-quality mountain bike! What colors can I choose for this bike? - You can choose from three beautiful colors for the Twitter MT390 U4000-9S: White, Matte Black, and Matte Titanium Gray. Pick the one that suits your style! How long is the warranty for this bike? - The Twitter MT390 U4000-9S comes with a 3-year warranty. This means you can ride with peace of mind knowing you're covered for any manufacturing defects. What is the delivery time for the bike? - Delivery for the Twitter MT390 U4000-9S may take between 17-35 business days (varies by region), depending on your location. Please be aware that processing might take up to 25 business days due to a high volume of orders. Can I return the bike if I don’t like it? - Yes! There is a 30-day return policy for the Twitter MT390 U4000-9S. If you are not satisfied with the bike, you can return it within 30 days of purchase. What size should I choose for the bike? - The Twitter MT390 U4000-9S is available in several frame sizes: 15”, 17”, 19”, and 21”. You can choose based on your height to ensure a comfortable ride. Is this bike suitable for beginners? - Absolutely! The Twitter MT390 U4000-9S is designed to be easy to handle, making it great for beginners or anyone looking to enjoy leisurely rides. What type of terrain can I ride on with this bike? - This bike is suitable for multiple terrains, including rugged mountain trails, smooth roads, and even gravel paths. It offers stability and control on various surfaces. What features make this bike durable? - The Twitter MT390 U4000-9S features a lightweight aluminum alloy frame, which is both strong and corrosion-resistant. This means it can withstand tough conditions while staying easy to handle. How do I maintain the bike after purchase? - To maintain your Twitter MT390 U4000-9S, regularly check the tire pressure, clean the frame and gears, and ensure the brakes are functioning properly. Routine maintenance will keep your bike in shape! Tags: Twitter MT390, U4000-9S, aluminum alloy mountain bike, MTB bike, lightweight mountain bike, TEKTRO hydraulic disc brake, all-terrain tires, bike frame sizes ## Details - **Price:** 1199.99 USD - 1299.99 USD - **Vendor:** Twitter Bikes - **Type:** TwitterBike - **Tags:** Twitter Mountain Bike ## Variants | Variant | Price | Available | |---------|-------|-----------| | U4000-9S / White / 27.5"×15" | 1239.99 USD | In stock | | U4000-9S / White / 27.5"×17" | 1239.99 USD | In stock | | U4000-9S / White / 27.5"×19" | 1239.99 USD | In stock | | U4000-9S / White / 27.5"×21" | 1239.99 USD | In stock | | U4000-9S / White / 29"×15" | 1239.99 USD | In stock | | U4000-9S / White / 29"×17" | 1239.99 USD | In stock | | U4000-9S / White / 29"×19" | 1239.99 USD | In stock | | U4000-9S / White / 29"×21" | 1239.99 USD | In stock | | U4000-9S / Matte Black / 27.5"×15" | 1239.99 USD | In stock | | U4000-9S / Matte Black / 27.5"×17" | 1239.99 USD | In stock | | U4000-9S / Matte Black / 27.5"×19" | 1239.99 USD | In stock | | U4000-9S / Matte Black / 27.5"×21" | 1239.99 USD | In stock | | U4000-9S / Matte Black / 29"×15" | 1239.99 USD | In stock | | U4000-9S / Matte Black / 29"×17" | 1239.99 USD | In stock | | U4000-9S / Matte Black / 29"×19" | 1239.99 USD | In stock | | U4000-9S / Matte Black / 29"×21" | 1239.99 USD | In stock | | U4000-9S / Matte Titanium Gray / 27.5"×15" | 1239.99 USD | In stock | | U4000-9S / Matte Titanium Gray / 27.5"×17" | 1239.99 USD | In stock | | U4000-9S / Matte Titanium Gray / 27.5"×19" | 1239.99 USD | In stock | | U4000-9S / Matte Titanium Gray / 27.5"×21" | 1239.99 USD | In stock | | U4000-9S / Matte Titanium Gray / 29"×15" | 1239.99 USD | In stock | | U4000-9S / Matte Titanium Gray / 29"×17" | 1239.99 USD | In stock | | U4000-9S / Matte Titanium Gray / 29"×19" | 1239.99 USD | In stock | | U4000-9S / Matte Titanium Gray / 29"×21" | 1239.99 USD | In stock | | U4000-18S / White / 27.5"×15" | 1299.99 USD | In stock | | U4000-18S / White / 27.5"×17" | 1299.99 USD | In stock | | U4000-18S / White / 27.5"×19" | 1299.99 USD | In stock | | U4000-18S / White / 27.5"×21" | 1299.99 USD | In stock | | U4000-18S / White / 29"×15" | 1299.99 USD | In stock | | U4000-18S / White / 29"×17" | 1299.99 USD | In stock | | U4000-18S / White / 29"×19" | 1299.99 USD | In stock | | U4000-18S / White / 29"×21" | 1299.99 USD | In stock | | U4000-18S / Matte Black / 27.5"×15" | 1299.99 USD | In stock | | U4000-18S / Matte Black / 27.5"×17" | 1299.99 USD | In stock | | U4000-18S / Matte Black / 27.5"×19" | 1299.99 USD | In stock | | U4000-18S / Matte Black / 27.5"×21" | 1299.99 USD | In stock | | U4000-18S / Matte Black / 29"×15" | 1299.99 USD | In stock | | U4000-18S / Matte Black / 29"×17" | 1299.99 USD | In stock | | U4000-18S / Matte Black / 29"×19" | 1299.99 USD | In stock | | U4000-18S / Matte Black / 29"×21" | 1299.99 USD | In stock | | U4000-18S / Matte Titanium Gray / 27.5"×15" | 1299.99 USD | In stock | | U4000-18S / Matte Titanium Gray / 27.5"×17" | 1299.99 USD | In stock | | U4000-18S / Matte Titanium Gray / 27.5"×19" | 1299.99 USD | In stock | | U4000-18S / Matte Titanium Gray / 27.5"×21" | 1299.99 USD | In stock | | U4000-18S / Matte Titanium Gray / 29"×15" | 1299.99 USD | In stock | | U4000-18S / Matte Titanium Gray / 29"×17" | 1299.99 USD | In stock | | U4000-18S / Matte Titanium Gray / 29"×19" | 1299.99 USD | In stock | | U4000-18S / Matte Titanium Gray / 29"×21" | 1299.99 USD | In stock | | M315-24S / White / 27.5"×15" | 1269.99 USD | In stock | | M315-24S / White / 27.5"×17" | 1269.99 USD | In stock | ## Images - Black bicycle on a white background Twitter MT390 U4000-9S Aluminum MTB Mountain Bike - Gray bicycle on a white background Twitter MT390 U4000-9S Aluminum MTB Mountain Bike - White bicycle with black tires on a white background Twitter MT390 U4000-9S Aluminum MTB Mountain Bike --- > Source: [Official Twitter Bikes Factory Store](https://www.twitterbikefactory.com/products/twitter-mt390-u4000-9s-mtb-aluminum-alloy-mountain-bike) > Updated: 2026-08-03