Curtis XR650

Our stunning 160mm travel dirt bike – now available as complete build!

The Curtis XR650 is our 27.5” wheeled 160mm travel single pivot dirt bike. This frame is designed for a 160/170mm fork, the swinging arm comes with 148mm boost dropout spacing and is 27.5 plus compatible up to a 2.8” plus tyre.

Winner of ‘best full suspension bike’ by Singletrack Magazine and voted one of the ‘top 5 stunning custom bikes’ by BikeRadar at Bespoked UK Handmade Bicycle Show, 2017.

The XR650 comes with a 65 degree head tube angle and has progressive geo top tube lengths for running shorter stems for more direct steer.

The material we chose for this frame and swinging arm is Aerospace grade T45, apart from the seat tube which is Reynolds 631. We know, love and trust T45 tubing and have used it since the 1980 – it has been at the heart of all our a national title wining dirt bikes in 4X and BMX.

Customise your XR650

  1. Head tube length and angle
  2. Frame height and length, to the mm
  3. Dropper post routing: stealth or standard
  4. Gear cable routing via hydro guides for full outer or cable stops for broken outer
  5. Personalised frame number, up to eight numbers or letters on the shock mount plates


Frame only, no shock
Standard paint: £1,750
Translucent red or blue: £1,800
Polished & clear coat: £1,900

Frame only with Fox float X2 factory shock
(Other shocks available on request)
Standard paint: £2,380
Translucent red or blue: £2,430
Polished & clear coat: £2,530

Complete build
Standard paint: £5,450
Translucent red or blue: £5,500
Polished and clear coat: £5,600
(pedals not included. Add Hope F20 flats for £115)

Complete build spec list

We have cherry picked top end products which we consider to be the best parts for the job.

Forks: Fox 36 Factory float FIT4
Seat post: Fox Transfer factory dropper 30.9mm
Dropper lever: Fox underbar remote
Shock: Fox Float X2 factory

Wheels: Hope tech enduro 27.5”
Brakes: Hope Tech 3 Enduro
Brakes: Hope 180 floating rotors F and R
Headset: Hope 1 1/8 top 1.5 bottom (for 44mm HT)
Pedals: Hope F20 flat pedal
(where pedals are required)

Bars: Renthal fat bar lite carbon, 40mm rise
Stem: Renthal Apex, 40mm
Grips: Renthal Kevlar lockons
Saddle: SDG Fly MTN

Rear Mech: Shimano XTR M9000 Shadow
Shifter: Shimano XTR M9000
Cranks: Shimano XT Cranks
Bottom bracket: Shimano XT
Chainring: Shimano XT thick thin 32
Cassette: Shimano XT

Full XTR groupset available on request.

Front Tyre: Schwalbe Magic Mary 27.5 x 2.35
Rear Tyre: Schwalbe Hans Dampf 27.5 x 2.35

Chain: KMC 11 speed gold


Here is a list of the RAL colours we offer, custom colours are also available.

  • Grey: 7015
  • Brown: 8001
  • Blue(s): 5024, 5002, 5015
  • Green(s): 6018, 6009,6019
  • Red(s):  3003, 3001, 3013
  • Purple: 4004
  • Yellow: 1007

View them on the Ral colour chart.

Our polished and clear coat finish is £150 extra, this hand polished finished takes a day to achieve and is finished with a clear powered coat which is tough as nails.

Size & Geometry Chart

Frame size
Actual Top Tube
Head Tube Length
Head Tube Angle
Seat Tube Angle
Chainstay Length
433mm 433mm 433mm 433mm
Bottom Bracket Height
345mm 345mm 345mm

Frame weight with no shock for a 17.5’” is 7.23 lbs / 3.86kg
Complete bike pictured weighed in at 32.04 lbs / 14.53kg (and this is with Schwalbe Magic Mary downhill tyres…)
Shock length for this frame is 216x63mm
Seat tube diameter is 30.9mm

Please ring for details.