2026 Top Fuel 8 Gen 4 Full Suspension Mountain Bike
Fully assembled, tuned, and test-ridden—ready to ride at pickup from any DFW Bike Mart location.
Expected to ship within 3 days
Professionally built and test-ridden before it ships. Arrives mostly assembled with just minimal setup needed. See Reassembly Instructions
Delivered fully assembled and tuned by Bike Mart—ready to ride right at your doorstep within 10 miles of any DFW location.
Ship
Get your bike or equipment delivered to your home directly from Bike Mart via our FedEx or USPS Carrier partners. Adult signature is required for all bike deliveries and for equipment & gear deliveries over $500.
For orders that include a bike, it will be professionally pre-built and shipped to your home with minimal assembly needed. While we try to make it as easy as possible, basic mechanical skills and proper tools are required. For orders that include a frameset please visit our support center to make sure you have the specialty tools and skills required.
If you decide to take your bike to a local retailer for assembly, additional fees will apply.
Pickup
We’ve made it easier than ever to get the gear and bikes you love—fast. With our Buy Online, Pick Up In Store (BOPIS) option, you can shop online and pick up your items at your convenience from any of our six DFW locations.
The best part about picking up at a Bike Mart location is that you get the same high quality service with the convenience of having the exact bike or part.
Bikes / Car Racks will be assembled and installed at no extra charge
Delivery
When you select "Home Delivery" at checkout. Your bike will be professionally assembled and the closest Bike Mart store will call you to schedule the delivery.
We offer home delivery for bike purchases only within 10 miles of a Bike Mart location. Contact us if you live beyond 10 miles and we can discuss more options. Additional fees may apply.
In stock bikes will be delivered within 7 days. Warehouse bikes will delivered within 14 days*.
2026 Top Fuel 8 Gen 4 Full Suspension Mountain Bike
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Make Top Fuel yours
Opt for light parts and a 120mm fork for a featherweight Top Fuel, or a 140mm fork and longer-stroke 130mm rear shock for extra versatility. Room for a longer dropper and MX wheels lets you customize Top Fuel into an ultimate playful trail whip.
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4-way Mino Link
Easily adjust the suspension and geometry four different ways for where and how you ride. With the flip of a chip, you can ride with more or less progressive suspension, and tweak your geometry for a slacker head tube and lower BB or steeper head tube and higher BB.
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New internal storage with new BITS bags
New internal frame storage bags make it easy to ditch the pack and still carry your ride essentials.
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Active Braking Pivot
Active Braking Pivot allows our engineers to tune how the suspension reacts to acceleration and braking forces independently. That means you get more confident control when you need it most.
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A better way to produce aluminum
Starting in 2024, we began removing high-emission aluminum from our manufacturing and replacing it with low-emission aluminum made with renewable energy. By October 2025, nearly every alloy bike we make - this one included - had made the switch, driving a major drop in our footprint.
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Shimano XT
Shimano XT is the original mountain bike groupset and trusted by generations of mountain bikers around the world. Whatever the trail, wherever you ride, XT is your solution for mountain biking today. Reliable shifting. Superior braking. Intuitive maintenance. XT is the high performance workhorse you can count on.
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Don’t forget your pedals
This bike doesn’t come with pedals because you’ll have a better time on your new bike if you choose your own. See the pedal guide to find the best pedals for your riding style. We recommend clipless road pedals for control and efficiency.
Overview
Overview
Technical Specifications
Technical Specifications
| Frame | Alpha Platinum Aluminum, internal storage, tapered head tube, internal guided routing, downtube guard, alloy rocker link, 4-way Mino Link, ABP, Boost148, 120mm travel |
| Fork | Fox Rhythm 34, Float EVOL air spring, GRIP damper, tapered steerer, 44mm offset, Boost110, 15mm Kabolt axle, 130mm travel |
| Shock | Fox Performance Float DPS, 2-position damper, 185mm x 50mm |
| *wheel front | Size: S Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle, 27.5''Size: M, ML, L, XL Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle, 29'' |
| *wheel rear | Size: S Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-bolt, Shimano Micro Spline freehub, Boost148, 12mm thru axle, 27.5''Size: M, ML, L, XL Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-bolt, Shimano Micro Spline freehub, Boost148, 12mm thru axle, 29'' |
| Skewer rear | Bontrager Switch thru axle, removable lever |
| *tire | Size: S Bontrager Gunnison Pro XR, Tubeless Ready, wire bead, 60 tpi, 27.5x2.40''Size: M, ML, L, XL Bontrager Gunnison Pro XR, Tubeless Ready, dual compound, aramid bead, 60 tpi, 29x2.40'' |
| Tire part | Bontrager TLR sealant, 6oz |
| Max tire size | Frame: 29x2.50\, Fork: See manufacturer |
| Shifter | Shimano XT M8100, 12 speed |
| Rear derailleur | Shimano XT M8100, long cage |
| Crank | Shimano Deore M6120, 30T ring, 55mm chainline, 170mm length |
| Bottom bracket | Shimano BB-MT501 BSA |
| Cassette | Shimano SLX M7100, 10-51T, 12 speed |
| Chain | Shimano SLX M7100, 12 speed |
| Max chainring size | 1x: 34T, min 30T |
| Saddle | Bontrager Verse P3, chromoly rails |
| *seatpost | Size: S Bontrager Line Dropper, 100mm travel, MaxFlow, internal routing, 34.9mm, 310mm lengthSize: M, ML, L, XL Bontrager Line Dropper, 170mm travel, MaxFlow, internal routing, 34.9mm, 450mm length |
| Handlebar | Bontrager Line, alloy, 35mm, 27.5mm rise, 780mm width |
| *grips | Size: S , M, ML, L, XL Bontrager XR Trail Comp, nylon lock-onSize: S , M, ML, L, XL Trek Line Comp, nylon lock-on |
| Stem | Bontrager Elite, 35mm, 0 degree, 45mm length |
| Brake | Shimano 4-piston hydraulic disc, M6100 lever, M6120 caliper |
| Brake rotor | Shimano RT66, 6-bolt, 180mm |
| Rotor size | Max brake rotor sizes - Frame: 200mm, min 180mm, Fork: see fork manufacturer |
| Bag | Bontrager BITS Internal Frame Storage Bag |
| Weight | M - 14.58 kg / 32.15 lbs (with TLR sealant, no tubes) |
| Weight limit | This bike has a maximum total weight limit (combined weight of bicycle, rider, and cargo) of 300 pounds (136 kg). |
Parts are subject to change without notice. Chat with us if you have any questions.
Geometry
Geometry
All measurements provided in cm unless otherwise noted.
| Frame size letter | S | S | M | M | ML | ML | L | L | XL | XL |
| Geometry position | High | Low | High | Low | High | Low | High | Low | High | Low |
| Wheel size | 27.5" | 27.5" | 29" | 29" | 29" | 29" | 29" | 29" | 29" | 29" |
| A — Seat tube | 36.0 | 36.0 | 41.0 | 41.0 | 42.0 | 42.0 | 43.5 | 43.5 | 47.0 | 47.0 |
| B — Seat tube angle (degrees) | 69.5° | 69.0° | 70.5° | 70.0° | 70.5° | 70.0° | 70.5° | 70.0° | 70.5° | 70.0° |
| Effective seat tube angle (degrees) | 76.5° | 76.0° | 77.3° | 76.9° | 76.6° | 76.2° | 76.3° | 75.9° | 75.6° | 75.2° |
| C — Head tube length | 10.5 | 10.5 | 10.5 | 10.5 | 11.0 | 11.0 | 11.5 | 11.5 | 13.5 | 13.5 |
| D — Head angle (degrees) | 65.9° | 65.5° | 65.9° | 65.5° | 65.9° | 65.5° | 65.9° | 65.5° | 65.9° | 65.5° |
| E — Effective top tube | 55.8 | 55.9 | 58.7 | 58.8 | 61.1 | 61.2 | 63.0 | 63.1 | 67.2 | 67.3 |
| F — Bottom bracket height | 35.1 | 34.5 | 35.4 | 34.8 | 35.4 | 34.8 | 35.4 | 34.8 | 35.4 | 34.8 |
| G — Bottom bracket drop | 1.0 | 1.6 | 2.6 | 3.2 | 2.6 | 3.2 | 2.6 | 3.2 | 2.6 | 3.2 |
| H — Chainstay length | 43.4 | 43.5 | 43.4 | 43.5 | 43.9 | 44.0 | 43.9 | 44.0 | 44.4 | 44.5 |
| I — Offset | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 |
| J — Trail | 11.1 | 11.5 | 12.1 | 12.5 | 12.1 | 12.5 | 12.1 | 12.5 | 12.1 | 12.5 |
| K — Wheelbase | 115.0 | 115.1 | 118.8 | 118.8 | 121.0 | 121.0 | 122.7 | 122.7 | 127.0 | 127.1 |
| L — Standover | 70.5 | 70.0 | 75.5 | 75.0 | 75.5 | 75.0 | 76.0 | 75.5 | 76.5 | 76.0 |
| M — Frame reach | 42.2 | 41.7 | 45.2 | 44.7 | 46.7 | 46.2 | 48.2 | 47.7 | 51.2 | 50.7 |
| N — Frame stack | 56.6 | 57.0 | 59.9 | 60.3 | 60.4 | 60.7 | 60.8 | 61.2 | 62.6 | 63.0 |
This Geometry Chart is provided by the Manufactuer. Chat with us if you have any questions.
Sizing
Sizing
| size | inches | cm |
|---|---|---|
| S | 5'1" - 5'5" | 155 - 165 |
| M | 5'5" - 5'10" | 165 - 177 |
| ML | 5'8" - 5'11" | 173 - 180 |
| L | 5'10" - 6'2" | 177 - 188 |
| XL | 6'2" - 6'5" | 188 - 195 |
Sizing to be used as a reference only. Chat with us if you have any questions.
