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.

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

  • Ken Evans

    “….we adjusted the rear mech before the start
    so I wouldn’t be able to shift to an easier gear….”

    Removing the unused sprockets would have saved weight.