Orange & Black

Aqua & Black


The Roadrat: Swift and Rugged Flat Bar Flyer

Road, Gravel, Commute, Adventures

Faster than a mountain bike on the road, way more fun and versatile than a traditional road bike, the Roadrat is your perfect 'other' bike. A Life Bike. Cruise into work or head for the hills. Go on holiday, or to the shops. Go on adventures, or get some headspace.

It was born of a desire for something swift and rugged to take on the rapidly crumbling tarmac of the urban landscape, but also up for disappearing for a few days with nothing but your sleeping bag and mat for company. We melded our iconic mountain bike fit and handling with fast road features and rigid forks.

All Cotic Life Bikes, including the Roadrat have big clearances for big tyres. We supply the bikes with big volume 700x37c slicks, or the latest WTB Road Plus 650b x 47c tubeless tyres. They roll fast, float over the potholes in the road and bumps in the trail. They give you comfort, control and a whole tonne of fun.

The bike is disc brake only, because we have always considered disc brakes to be the best, strongest, safest option for road or offroad riding. It's in the DNA of the Roadrat, right from the original 2006 version - one of the first road bikes to feature disc brakes.

Our brand new RB4 front fork moves to aluminium/carbon hydrid construction to keep the weight down and comfort high. A 12mm thru axle keeps everything accurate and together with the strongest of hydraulic brakes.

All the fittings are there for two bottles, rear rack, and full mudguards. Cotic Dogsbody track end dropouts let you do almost anything; regular gears, fixed, singlespeed or hub gear. Why limit yourself and your bike to just one thing?

Colours are Gloss Orange, or Gloss Aqua.

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Photo Gallery

Features and Benefits

Following our customers' feedback, the Roadrat4 now features a tapered head tube with integral headset cups running into our brand new RB4 aluminium/carbon tapered steerer fork. Super clean, smooth looks. Light, comfortable and accurate ride from the carbon fork legs and 12mm thru axle hub interface. Tapered steerer means greater handling precision and many more options should you wish to change your fork at a later date.

The small and medium frames now feature shorter seat tubes and lower top tubes for better stand over clearance on those sizes.


Cotic frames are designed, developed, engineered and tested entirely by us at our base in the Peak District, near Sheffield in the UK. Our founder - Cy Turner - is the lead designer and engineer, and our frames are rigorously ride tested by everyone at Cotic, and our Race Team. They are fully certified and lab tested in excess of the requirements of ISO4210 safety standards.

This frame is hand made in Taiwan by our specially selected framebuilder, chosen because of their vast experience with our favourite materials, and their top quality finish. They are the best in Taiwan for what we need.

Each frame is dip coated inside and out with zinc phosphate before painting, to prevent corrosion and ensure the best paint finish. After we've agonised over the colours, designs and decals the frames are painted to the highest quality including a protective clear coat, before extensive QC by our agent in Taiwan. Once the frames reach us in the UK, we carry out further QC, and prep the frames for headset and bottom bracket installation.

As always, all complete bikes are built to order by us here in the Peak District, to the exact spec of your choice. We build your bike for you.

Frame & Fork Specifications

Geometry and Sizing Chart

The chart is a guide to frame size for the latest version of the ROADRAT: Ultra Compact Geometry - Roadmeans that the frames are low and long. You'll probably need a 330mm seatpost due to the compact sizing, and as a guide, the top tube lengths are identical to our MTB frames if you're coming over from our mountain bikes. You lot are just too different to say for sure, so drop us a line at and we'll be happy to discuss set up based on what you're riding at the moment.

dimensions in mm

Frame Size Small Medium Large
Seat Tube (centre-top) 46cm 50cm 54cm
Top Tube Length (Effective) 575mm 591mm 610mm
Reach 399mm 411mm 427mm
Stack 579mm 589mm 598mm
Chainstay Length 425mm 425mm 425mm
Wheelbase 1032mm 1048mm 1067mm
Head Angle 72 72 72
Seat Angle 73 73 73
BB Drop 60mm 60mm 60mm
Head Tube Length 160mm 170mm 180mm
Usual Height Range up to 175cm 173cm - 180cm 180cm - 191cm
Stem Length 90mm-120mm 90mm-120mm 90mm-120mm
Forks included with frame:
Fork Length 400mm 400mm 400mm
Fork Offset(centre-top) 45mm 45mm 45mm

dimensions in inches

Frame Size Small Medium Large
Seat Tube (centre-top) 18.1" 19.7" 21.3"
Top Tube Length (Effective) 22.6" 23.3" 24.1"
Reach 15.7" 16.2" 16.8"
Stack 22.8 23.2" 23.5"
Chainstay Length 16.7" 16.7" 16.7"
Wheelbase 40.6" 41.3" 42"
Head Angle 72 72 72
Seat Angle 73 73 73
BB Drop 2.3" 2.3" 2.3"
Head Tube Length 6.3" 6.7" 7.1"
Usual Height Range up to 5'9" 5'8" - 5'11" 5'10" and over
Stem Length 3.5"-4.7" 3.5"-4.7" 3.5"-4.7"
Forks included with frame:
Fork Length 15.75" 15.75" 15.75"
Fork Rake(centre-top) 1.75" 1.75" 1.75"

Component Sizes

Seatpost diameter: 27.2mm (330mm long minimum)

Seatpost clamp: 29.8mm or 30.0mm (bolt up clamp is included)

Front Mech: 28.6mm (bottom pull)

Bottom Bracket width: 68mm

Bottom Bracket thread: Conventional English/BSA

Headset: IS41/28.6 Upper Cup, IS52/40 Lower Cup, integral taper steerer

Front hub: 12mmx100 thru axle

Rear Hub: 135 QR

Front Disc Mount: Flat Mount

Rear Disc Mount: International Standard (IS)

Components we can sell you to help with your build

Complete Headsets Life Bike Tapered Headtube
Cane Creek Headset 40 Series IS41/IS52£45
Hope 7J for tapered steerer Life Bike (black)£80
Hope 7J for tapered steerer Life Bike (orange)£80
Hope 7J for tapered steerer Life Bike (purple)£80
Hope 7J for tapered steerer Life Bike (blue)£80
Hope 7J for tapered steerer Life Bike (red)£80
Hope 7J for tapered steerer Life Bike (silver)£80
Hope 7J for tapered steerer Life Bike (bronze)£80

(headset prices include fitting)