Mondraker Summum RR Mullet Bike

The Mondraker Summum RR Mullet Bike is Mondraker's aluminum downhill race platform built for riders who want to go as fast as possible on the most demanding terrain. At $8,799, the Summum RR Mullet sits at the top of Mondraker's alloy DH lineup — stacked with Fox Factory Kashima suspension front and rear, Shimano Saint brakes, and a mullet wheel configuration that reflects where competitive downhill racing has landed. The "RR" designation marks this as race-ready spec: fully equipped to drop into a World Cup course and equally capable of charging bike park laps from open to close.

Mondraker has been competitive at the highest levels of DH racing for over a decade, and the Summum platform carries that design intent through every detail. The Summum MX 6061 alloy frame uses Stealth Evo hydroformed tubing and Mondraker's Zero Suspension System — a dual-link rear suspension design that actively isolates braking forces from the suspension path. Where many DH bike designs sacrifice suspension sensitivity when riders brake hard into corners, the Zero system keeps the rear wheel tracking regardless of braking input. Combined with 200mm of rear travel and a Fox DHX2 Factory coil shock with Kashima coating, the Summum delivers a plush, progressive feel that holds up through repetitive big hits without packing down. The Fox 40 Float Factory Kashima fork at 203mm of travel completes the suspension package — GRIP X2 damper, Factory tune, and the same specification found on Fox-supported World Cup race programs.

The mullet wheel configuration — 29-inch front, 27.5-inch rear — is the design decision that defines this bike's character on track. The larger front wheel rolls over trail debris more easily, carries more corner-entry speed through rocks and roots, and provides a more planted feel under hard braking. The 27.5 rear offers a lower bottom bracket, faster acceleration, and a more agile feel through tight, technical sections and compressed corners. e*thirteen Grappler Race DH wheels run hookless 6069 welded alloy rims at 30mm internal width — built specifically for downhill racing with 32-hole lacing and tubeless-ready construction. Maxxis Assegai 29x2.5" WT with 3C MaxxGrip compound and DH casing handles the front, matched by a Maxxis Dissector 27.5x2.4" WT in the rear — a high-grip, DH-cased combination that performs across variable conditions.

Shimano Saint M820 4-piston brakes with 203mm ICE TECH 6-bolt rotors provide the stopping power this bike demands on sustained descents. Saint is Shimano's DH-specific brake lineup — engineered for the heat loads generated on long, steep runs where lesser systems begin to fade. The ICE TECH two-piece rotors dissipate heat faster than standard rotors, maintaining consistent modulation lap after lap. The Shimano Saint 10-speed drivetrain runs a 36T front ring on Saint M825 Hollowtech II cranks at 165mm — appropriate arm length for maintaining foot clearance in rough terrain. The Onoff S9 DH CNC Integrated stem at 45-50mm adjustable length pairs with an Onoff S9 DH handlebar at 800mm width. Onoff is Mondraker's in-house component brand, developed in parallel with the frame. The headset is an Onoff ZS56/ZS56 unit that ships with a Geometry Kit — ±1° and ±2° adjustment cups that allow riders to tune head tube angle to match track conditions or personal preference without replacing any frame hardware.

Design Benefits

1. Zero Suspension System with active brake isolation — Mondraker's dual-link rear suspension separates braking forces from the suspension path, keeping the rear wheel fully active through corners where riders are braking hard. At high speed on steep terrain, this delivers more consistent traction and less chassis instability when the rear brake is loaded — a difference that is immediately noticeable on an actual DH run.
2. Fox Factory Kashima at both ends — the Fox 40 GRIP X2 fork and DHX2 coil shock both run Kashima coating and Factory damper tune. The coil DHX2 delivers a supple, linearly progressive feel that holds up through repeated big hits better than air springs at this travel range, and the GRIP X2 damper provides independent high and low-speed compression and rebound adjustment on the fork.
3. Mullet wheel configuration — the 29/27.5 setup is the current consensus in competitive downhill racing for good reason. The larger front rolls over debris, maximizes grip in braking zones, and stabilizes the front end at speed. The smaller rear lowers the bottom bracket, accelerates faster out of corners, and keeps the chassis agile through tight and technical sections.
4. Shimano Saint M820 brakes with ICE TECH rotors — Saint is engineered specifically for sustained descending loads. ICE TECH heat dissipation prevents fade on long, steep runs, and 4-piston actuation across 203mm rotors delivers stopping power with precise modulation — not just raw bite.
5. Geometry Kit headset with ±1° and ±2° adjustment — the Onoff headset ships with cups that allow head tube angle adjustment by 1 or 2 degrees in either direction. Steeper for tight, technical tracks; slacker for open high-speed courses. Track-specific geometry tuning without swapping any frame hardware is a feature typically reserved for custom builds.

Final Take

The Summum RR Mullet is for riders who spend real time at the bike park or on DH courses and want a race-caliber machine without the carbon upcharge. The Fox Factory suspension, Shimano Saint spec, and mullet wheel configuration are uncompromised for the intended use. At $8,799, this is one of the most capable aluminum downhill bikes available — built to Mondraker's race pedigree and priced to be ridden hard.