Summum RR Mullet (c=89)

The current Summum lineup is split between alloy and carbon frame options, with builds generally categorized into standard, R, and RR tiers. The entry-level and mid-tier R models utilize either the 6061 alloy or standard carbon frames, paired with mid-range suspension like the Fox 40 Performance fork and DHX2 Performance Elite coil shock. These builds keep the initial purchase price accessible but have been noted by reviewers as a potential performance bottleneck for heavier or highly aggressive riders.

At the top of the ladder, the RR Mullet build represents a significant jump in both price and specification. Retailing for $8,799, it features a Fox 40 Factory fork with the GRIP X2 damper, a Fox DHX2 Factory shock, and a full Shimano Saint 10-speed downhill drivetrain and brake set. This premium model also upgrades the rolling stock to e*thirteen Grappler Race DH wheels laced to SuperBoost hubs. Tire specification varies by tier and model year, with current top models utilizing Maxxis downhill-casing rubber, while previous mid-tier builds shipped with Michelin tires. The value proposition of the Summum heavily depends on the rider's budget; the alloy models offer a solid foundation, while the RR build delivers a true race-ready package.

Reviewers consistently characterize the Summum as a highly stable, race-focused descender that excels on fast, demanding tracks. The bike's length and suspension design allow it to carry momentum through rough terrain, with testers noting it provides a "supple, smooth ride during compressions" (Vital MTB). The carbon frame in particular receives praise for its vibration damping, remaining quiet and composed over high-frequency chatter. While the long wheelbase inherently favors straight-line speed, testers found the mixed-wheel models surprisingly agile. One rider noted the mullet setup made the bike "more agile than I had expected from looking at its geometry" (Vital MTB), requiring minimal energy to place the bike on jump trails. Even on the heavier alloy models, the geometry ensures "pretty chilled handling" (Bike-test) when the trail gets steep and rough.

However, reviewers identified clear limitations with the mid-tier suspension specifications. On the R-level builds, testers reported that the Fox Performance series fork and shock struggled under aggressive riding. The suspension "lacked mid-to-ending stroke support" (Vital MTB) and became overwhelmed during repetitive impacts, effectively capping the bike's top speed potential for expert riders. Component durability on these mid-range models also drew criticism, specifically regarding a blown rear shock and aluminum wheels that rapidly lost spoke tension. Despite these spec-related drawbacks, the underlying chassis is widely regarded as an exceptional foundation for downhill racing.