Trek Top Fuel 9.8 XT Di2 Gen 4 — 2026 Full Suspension Mountain Bike

Frame: OCLV Mountain Carbon front and rear triangles with alloy rocker link, internal down-tube storage compartment (includes Bontrager BITS bag), and SRAM UDH derailleur hanger

Fork / rear shock: RockShox Pike Select+ fork (130mm travel, DebonAir spring, Charger 3.1 RC2 damper) paired with a RockShox Deluxe Ultimate RCT rear shock (120mm travel)

Drivetrain: Shimano Deore XT M8250 Di2, 12-speed electronic wireless shifting, 10-51T cassette

Brakes: Shimano Deore XT M8220 4-piston hydraulic disc brakes with 180mm Shimano RT86 rotors

Wheels & tyres: Bontrager Line Comp 30 alloy wheels (tubeless ready) on Bontrager Gunnison/Montrose RSL XT tubeless-ready 2.4" tyres

Cockpit: Bontrager Line Pro OCLV Carbon handlebar (780mm), Line Pro stem, and a Bontrager Line dropper post with MaxFlow technology

Weight: 30lb 13.8oz / 14.0kg (size MD)

Standout feature: Mino Link 4 flip chip adjusts geometry (High/Low) and suspension leverage rate (more/less progressive), with all sizes convertible to a mullet (mixed-wheel) setup

The Top Fuel 9.8 XT Di2 Gen 4 suits intermediate to advanced riders who want a genuinely lightweight, efficient bike for climbing-heavy days on trails like Hydraulink or Okanagan Mountain Park, but still want real suspension performance and a dropper post when the trail points down. It's a strong fit for someone upgrading from a hardtail or an older, heavier trail bike who wants the Top Fuel's adjustability to dial in their preferred geometry and ride feel as their skills progress.

Our team at Fresh Air will help you find the right fit in-store at both Kelowna locations. Stop by to work with one of our experienced staff members, or call 250-763-3425.

Frame geometry and sizing details for the Trek Top Fuel 9.8 XT Di2 Gen 4 are available on the Trek website. Trek offers the Top Fuel 9.8 XT Di2 Gen 4 in SM through XL. Our team at Fresh Air can help you find the right frame size based on your height, inseam, and riding style — come in to either Kelowna location and we'll get you dialled in.

Our team will set up your sag, rebound, and compression on both the RockShox Pike fork and Deluxe Ultimate rear shock to match your weight and riding style, so the Top Fuel's suspension is working the way it's meant to from your first ride. We'll also route and test your Bontrager dropper post, and since this bike comes tubeless-ready, we can walk you through tubeless tyre setup or handle it in-shop before you head out. If you're curious about the Mino Link 4 flip chip, we can talk through the geometry and progression settings and help you find the configuration that suits your local trails best. Drop into Fresh Air Pandosy (555 Groves Ave) or Fresh Air Dilworth (1656 Dilworth Drive), or book an appointment online.

Q1: What size Trek Top Fuel 9.8 XT Di2 Gen 4 do I need?
Trek offers the Top Fuel 9.8 XT Di2 Gen 4 in SM, MD, ML, LG, and XL, sized around rider height and reach. For an exact fit, check the geometry chart linked above and come see us in-store — our team can measure you up and compare sizes side by side at either Kelowna location.

Q2: Is the Trek Top Fuel 9.8 XT Di2 Gen 4 right for Hydraulink or Okanagan Mountain Park trails?
Yes — its short-travel suspension and lightweight carbon frame make it a strong climber for the approaches into Hydraulink and Okanagan Mountain Park, while still giving you a capable, poppy ride on the way back down.

Q3: How do I set up the suspension on the Top Fuel 9.8 XT Di2 Gen 4 for my weight and riding style?
Suspension setup starts with sag — typically around 25-30% on the RockShox Pike fork and Deluxe Ultimate shock — then fine-tuning rebound and compression to your weight and preferred feel. Our team can set this up for you in-store and walk you through the Mino Link 4 flip chip if you want to adjust geometry or progression further.