Fenrir Stainless
The Otso Fenrir is a ride-anywhere bike for bikepacking races and afternoon adventures alike. It can be built with drop bars or with MTB bars and both selections are available as stock build options. A tire clearance of 29" x 2.8" or 27.5" x 3.0" keeps the Fenrir rolling on rough terrain, while extra frame and fork braze-ons are ready to carry gear for days or weeks on the trail. Like all Otso bikes, the Fenrir has adjustable geometry via the patented Tuning Chip rear dropout system that makes the bike as adaptable as its rider.
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WHEEL SIZE
29"
FRAME MATERIAL
Stainless Steel
Build SpecsGEOMETRY
Build Specs
| DROP BAR | FLAT BAR | |
|---|---|---|
| Frame | Custom butted austenitic stainless steel frame | Custom butted austenitic stainless steel frame |
| Fork | Carbon Enve Mountain Fork, 15mm thru axle | Carbon Enve Mountain Fork, 15mm thru axle |
| Headset | Wolf Tooth Performance Headset | Wolf Tooth Performance Headset |
| Rear derailleur | Shimano GRX 810, 11-speed | TRP G-Spec TR12, 12-speed |
| Front derailleur | N/A | N/A |
| Shifters | Shimano GRX 600, 11-speed | TRP G-Spec TR12, 12-speed |
| Cassette | Shimano SLX, 11-46T, 11-speed | SRAM GX, 10-51T, 12-speed |
| Brakes | Shimano GRX 600 hydraulic | Magura MT4 hydraulic |
| Cranks | Race Face Aeffect | Race Face Aeffect |
| Handlebar | Lithic Corundum aluminum compact drop with 16° flare | Lithic flat bar |
| Tape / Grips | Wolf Tooth Supple Lite Bar Tape | Wolf Tooth silicone foam grips |
| Wheels | Sun Ringle Duroc 30 | Sun Ringle Duroc 30 |
| Tires | Maxxis Aspen 29" x 2.4" | Maxxis Aspen 29" x 2.4" |
| Frame Sizes | XS, S, M, L, XL | XS, S, M, L, XL |
| XS | S | M | L | XL | |
|---|---|---|---|---|---|
| Recommended rider height | 4'10"-5'4" | 5'3"-5'7" | 5'7"-5'11" | 5'11"-6'3" | 6'3"-6'6" |
| Effective top tube | 547mm | 565mm | 583mm | 600mm | 618m |
| Nominal head tube angle | 68° | 68° | 68° | 68° | 68° |
| Tuning Chip induced head/seat tube angle change | ±0.2° | ±0.2° | ±0.2° | ±0.2° | ±0.2° |
| Head tube length | 90mm | 100mm | 120m | 140mm | 160mm |
| Nominal seat tube angle | 75° | 75° | 75° | 75° | 75° |
| Seat tube length | 360mm | 400mm | 450mm | 490mm | 530mm |
| Bottom bracket drop | 68-72mm | 68-72mm | 68-72mm | 68-72mm | 68-72mm |
| Chainstay length | 430-450mm | 430-450mm | 430-450mm | 430-450mm | 430-450mm |
| Wheelbase | 1090-1110mm | 1110-1120mm | 1130-1150mm | 1150-1170mm | 1170-1190mm |
| Trail | 88mm | 88mm | 88mm | 88mm | 88mm |
| Fork offset | 51mm | 51mm | 51mm | 51mm | 51mm |
| Rigid fork axle to crown length | 495mm | 495mm | 495mm | 495mm | 495mm |
| Stack | 595mm | 605mm | 623mm | 642mm | 660mm |
| Reach | 387mm | 403mm | 416mm | 428mm | 441mm |
| Standover | 754mm | 777mm | 810mm | 838mm | 866mm |
