Archive: Roadrat Gen4
Years of production: 2017-2018
Preceded by the Roadrat Gen3.
The fourth and final generation Roadrat was our swift and rugged flat bar flyer. We melded our iconic mountain bike fit and handling with fast road features and a rigid fork.
Faster than a mountain bike on the road, way more fun and versatile than a traditional road bike, the Roadrat was the perfect 'other' bike: a Cotic Life Bike. Swift and rugged, it was born of a desire for something to take on the crumbling tarmac of the urban landscape, but just as happy disappearing for a few days with nothing but a sleeping bag and mat for company. Road, gravel, commute, adventures: it took you to work, to the shops, on holiday, to the hills, or just to that quiet place where you get some headspace.
Disc brakes have been in the Roadrat's DNA since the original 2006 version, one of the first road bikes to feature them.
Finishes: Gloss Aqua and Gloss Orange, both with black.
Sizes: Small, Medium and Large. Wheels: 700c, or 650b Road Plus.
What changed from Gen3
- Tapered head tube with integral headset cups, for clean looks and more fork options
- New RB4 fork with aluminium/carbon hybrid construction and a tapered steerer, keeping weight down and comfort high
- 12mm thru-axle front hub for accuracy with powerful hydraulic brakes
- Shorter seat tubes and lower top tubes on the Small and Medium for better standover
- 650b Road Plus option: WTB 650b x 47c tubeless tyres as an alternative to 700 x 37c slicks
Frame details
- Big tyre clearance: supplied with big-volume 700 x 37c slicks or WTB Road Plus 650b x 47c tubeless tyres, for comfort, control and fun
- Disc brakes only: flat mount front, IS rear
- Fittings for two bottles, a rear rack and full mudguards
- Cotic Dogsbody track-end dropouts for regular gears, fixed, singlespeed or hub gears
- RB4 aluminium/carbon fork with tapered steerer and 12mm thru axle, included with the frame
- Ultra Compact road geometry: low and long, with top tube lengths matching our mountain bike frames
Geometry
Ultra Compact geometry means the frames are low and long, so you'll probably need a 330mm seatpost. If you're coming from our mountain bikes, the top tube lengths are identical. Email size@cotic.co.uk for help.
Roadrat Gen4
| Frame size | Small | Medium | Large |
|---|---|---|---|
| Seat tube (centre-top) | 460mm | 500mm | 540mm |
| Top tube (effective) | 575mm | 591mm | 610mm |
| Head angle | 72° | 72° | 72° |
| Seat angle | 73° | 73° | 73° |
| Chainstay length | 425mm | 425mm | 425mm |
| BB drop | -60mm | -60mm | -60mm |
| Head tube length | 160mm | 170mm | 180mm |
| Reach | 399mm | 411mm | 427mm |
| Stack | 579mm | 589mm | 598mm |
| Wheelbase | 1032mm | 1048mm | 1067mm |
| Usual height range | up to 175cm | 173-180cm | 180-191cm |
| Stem length | 90-120mm | 90-120mm | 90-120mm |
| Fork length (included) | 400mm | 400mm | 400mm |
| Fork offset | 45mm | 45mm | 45mm |
Fork included with frame.
Component sizes
- Seatpost diameter: 27.2mm (330mm long minimum)
- Seatpost clamp: 29.8mm or 30.0mm (bolt-up clamp included)
- Front mech: 28.6mm, bottom pull
- Bottom bracket: 68mm width, conventional English/BSA thread
- Headset: IS41/28.6 upper, IS52/40 lower, integral, for the tapered steerer
- Front hub: 12 x 100mm thru axle
- Rear hub: 135mm QR
- Front disc mount: flat mount
- Rear disc mount: International Standard (IS)
Download the general Cotic user manual (PDF)
Origin
Designed, developed, engineered and tested by us in the Peak District, with Cy Turner as lead designer and engineer, and lab tested beyond ISO 4210. Frames were hand made in Taiwan by our selected framebuilder, zinc phosphate dip-coated inside and out before painting, finished with a protective clear coat, and QC'd in Taiwan and again in the UK. Complete bikes were built to order in the Peak District.
Photo gallery
