700c / 650B / 26 inch Thorn Mk3 Steel Disc Fork - Gunmetal Imron

£159.00 Please note this product has selling restrictions to your country. was
Manufacturer : 
SJS Cycles part number : 
Manufacturer part number : 
- For disc brake only
- Through axle 15 x 110mm included, for boost hubs only
- High quality Reynolds steel blades and Cr-Mo steerer
- Thorn Twin Plate Crown is lightweight, very stong and gives more clearance and increased comfort compared to various unicrown designs
- Suitable for a variety of tyre sizes
- Stainless steel fittings for direct and secure mounting of mudguards
- M6 Fittings for mudguard stays and lo-loader front carrier
- ISO Disc mount
- 1 1/8 inch steerer - 395mm long, may be cut to suit
- L1 Dimension (Axle to Crown Race Seat): 410mm
- Weight: 1.51kg with steerer at full length
- NOTE: Does not include crown race seat

Sufficient clearance to be used with mudguards and;
- 26" tyres up to 2.8"
- 650b tyres up to 60b
- 700c tyres up to 40c

Sufficient clearance to be used without mudguards and;
- 26" tyres up to 3.0"
- 650b tyres up to 70b
- 700c tyres up to 50c

Available in 3 different offsets to suit the following Thorn frames;
- Mercury Mk3
- Club Tour Mk5
- Nomad Mk3

Available in three different offsets to suit the corresponding Thorn Nomad Mk3 frames.

A = 48mm - suitable for: 55L, 58L, 61S, 61L
B = 53mm - suitable for: 47S/T, 50L, 52L, 58S
C = 60mm - suitable for: 40S/T, 50S, 52S, 55S
Product Reviews (0)
Questions & Answers (5) Q & A
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Good quality fork.
By Matthew
09 Feb 2020
5 / 5
I recommend this product
ProsStrong, functional, well made
Good quality fork, well made and solid. Everything fitted easily during the build. Lots of mounting points. Helpful support for bike build from Sarah and Simon at SJS.
Questions & Answers (5)
Is this fork available in an offset that will suit a 580L Mk 2 Mercury?
17 Jan 2024
For any information or advice on any of Thorn bikes, frames and forks or parts, please contact our dedicated Thorn bikes sales team either on 01278 441505 or [email protected] and they'll be able to provide you with all of the information you need.
Hi, what is the max rotor size for this fork? Thanks
23 Aug 2020
Hello, The minimum rotor size is 180mm and the max size is 203mm.

Hope this helps,

What are the advantages of these forks over the older 700c disc forks?
11 May 2020
What is the difference in weight between these forks and the older 700c disc forks for the Mk 4 CT frame? Which has the stiffer ride? Can both set of forks use both 700c and 650b wheels? What other differences are there?
They now accept hubs with a through axle 15 x 110mm for boost the older fork (SJS Cycles part number : 32883RG46 for example) were for regular 9mm axles 100mm spacing QR. RT
What does the fork weigh? Can this be used with the Nomad Mk 2? If not, why not?
11 May 2020
1.54kg but the - L1 Dimension (Axle to Crown Race Seat): is 410mm The Nomad mk2 needs an L1 of - 420mm with 48mm offset, reducing the L1 by 10mm will lower the head and slightly increase the head angle of a mk2 Nomad and lowering the b/b by perhaps 4mm (not much) RT
Any plans to produce this fork in black?
10 Apr 2020
Hi, no not at this time. They are painted to match the Thorn frames. Thanks. 10/04/2020