Gunnar Gronlund’s super-light Trigon hill-climb bike

Cycling Weekly took the opportunity at Sunday’s Monsal hill-climb to look at Gunnar Gronlund’s ultra lightweight Trigon hill-climb bike. The current National Hill-Climb Champion’s bike tips the scales at a fraction over 6kg as seen here.

The heart of the bike is a Trigon SL Project carbon frame in a small (49cm) with carbon fork. The frame weighs in at 836g. Gronlund uses Trigon integrated bars with SRAM Red levers. The integrated bar equates to having a 90mm stem with a bar width of 42cm.

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Gronlund tells CW of the bars: “They are not the lightest option out there but I absolutely love this integrated bar. It’s comfortable and offers so much extra stiffness compared to a traditional setup which is perfect when riding these short climbs when you are out of the saddle a lot.”

Wheels are special Cero custom prototype carbon ‘hoops’ for tubs and weigh 1183g for the pair as seen. Here’s the lowdown on the wheels as built by Rob Dixon at Gronlund’s local bike shop.

The front wheel build
Alchemy ELF hub
20x DT Revolution 1,5-1,8 reduced spokes
High Strength 7000-series Aluminium nipples

and for the rear
Powertap SL+ hub
24x DT Revolution 1,5-1,8 reduced spokes
High Strength 7000-series Aluminium nipples

Gronlund tells CW: “During the race I rode the climb on 44×19 all the way up. In fact, we adjusted the rear mech before the start so I wouldn’t be able to shift to an easier gear than that. We left the option to change to heavier gears though…”

Gunnar Gronlund with his special Trigon hill climb bike

Vision Trimax Carbon 170mm cranks with a FSA 44 chainring. Aluminium fixing bolts and ceramic BB. SRAM Red front mech. Speed play Zero pedals. SRAM PC1091 chain

SRAM Red rear mech and SRAM 11-25 block. Jagwire L3 cabling which is used throughout the bike

PowerTap hub to check the wattage output

Slim Alchemy ELF hub and ultra-slim carbon wheel quick release

Trigon VCS03 all carbon saddle and Trigon EX Carbon Super Lite Version seat pin

Gunnar Gronlund and bike in action

Related links

Full gallery of Andy Jones’ Monsal Hill-Climb photos

Pullar pulls surprise Monsal hill-Climb win