Comas R1 20" Frame

Comas R1 20” Frame

Description and materials
- Comas R1 20” bike trials frame, the first trials frame from new trials brand Comas.
- Developed and tested for months by Eloi Palau, with the support of bike trials legend and Comas owner Dani Comas.
- Exclusive geometry and design, combining tubes with unique curvatures and sections.
- Made of 6082-T6 aluminium alloy, to achieve the perfect balance between low weight and high strength.
- Features a tapered headtube, for 1 1/8” – 1,5” tapered headsets.
- The headtube has a large front hole that reduces weight considerably by removing any excess weight.
- Top tube has a triangular section.
- Down tube has optimized curvature near the BB, and it’s joined to the headtube with a gusset that increases strength.
- Threaded 68mm wide BB tube, without bashplate mounts (a bashring must be used).
- Moreover, the BB tube has built-in, CNC-machined gussets for the chainstays, multiplying strength and stiffness.
- The seat stays are joined to the top tube with a gusset, similar to a brake booster, which is essential to avoid rear-end flexion.
- Oversized seat and chainstays, with rectangular sections, to increase rear triangle’s stiffness.
- Integrated Post Mount disc brake mounts on the left dropout, CNC machined to ensure top strength and durability.
- CNC machined dropouts, designed for snail cam chain tensioners.

The 7 Compatibility Keys
Below you can find the main details you need to consider when installing different components on this frame:

- 1) Headset. Since the headtube on this frame is tapered, with 1 1/8” top and 1,5” bottom diameters, it’s compatible with 1 1/8” – 1,5” tapered forks. If you’d like to use a standard 1 1/8” diameter fork, you can install an adaptor for the bottom cup, which you can find here.

- 2) Bashplate. This frame doesn’t have any bashplate mounts, therefore you must use a bashrinig, as you can find here.

- 3) Bottom Bracket. A threaded bottom bracket with standard 1.37”x24tpi thread must be used, therefore any traditional or BB30 threaded BBs can be used (Try-All, Hashtagg, etc.).

In order to prevent the cranks from rubbing the seat stays, which may happen due to varying crank offsets for each model, it’s recommended to install a 127,5mm or 128mm wide bottom bracket.

- 4) Rear Brake. This frame has Post Mount rear disc brake mounts, so be sure to use a rear brake of that type. Post Mount brake calipers sit onto the brake mounts, instead of sideways (as is the case on IS calipers).

- 5) Chain tensioner. This frame requires snail cam chain tensioners, available here.

- 6) Rear hub. Since this frame features double-wheel chain tensioner mounts, a 116mm wide rear hub must be used. In case you’d like to install a rear hub with 110mm spacing (common in most 20” bikes that use snail cams), then you must add 3mm spacers to each side of the hub, in order to result in the total of 116mm this frame requires. You can find one here.

Also, since this frame only has disc brake mounts, the rear hub must feature disc brake mounts too.

- 7) Fork. The steerer tube on your fork must be long enough so that at least 2mm of it remain above the top bolt of your stem’s steerer tube clamp.
To ensure this, you must add the length of the headtube (120mm for this frame), plus the cups bits that sit outside the headtube, plus the headset spacers (if any) and/or dust cover sitting under the stem, plus the length of your stem’s steerer tube clamp. Once you’ve done this, you’ll be ready to know if your fork is long enough so that at least 2mm of it remain above the top bolt of your stem’s steerer tube clamp.

Geometry
- Space between dropouts: 116mm
- Bottom bracket shell: 68mm
- Head tube length: 120mm, 1 1/8” – 1,5” tapered

- Wheelbase: 1008mm
- Chainstay Length: 350mm
- BB Rise: +85mm
- Head Angle: 72º

Finishes
- Anodized black finish, with Comas R1 stickers already installed in white, black and red.

Weight
- 1.579Kg