700c / 650B Thorn ST 700 / 650B Steel Fork - Matt Black Powder

£180.00 Please note this product has selling restrictions to your country. was
Manufacturer : 
SJS Cycles part number : 
Manufacturer part number : 
- Manufactured using high quality Reynolds steel blades and Cr-Mo steerer
- Investment cast fork crown is lightweight, elegant and strong
- Reversible brake bosses allow 700c or 650b (584) rims to be used with cantilever or V-brakes
- Stainless steel M5 fittings for direct and secure mounting of mudguards and lo-loader front carrier
- Sufficient clearance for mudguards and 650b tyres up to 50b or 700c tyres up to 40c
- L1 Dimension (Axle to Crown Race Seat): 390mm
- Steerer: 1 1/8" / 380mm Length (can be cut shorter to required length)
- Does not include crown race seat
- Weight: 1055g when steerer cut to 300mm (-/+ 1.03g per mm)

Available in Offsets A, B and C 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.
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Questions & Answers (4)
Rear boss solutions?
01 May 2020
Further to last query, would SJS have rear adaptors for brake bosses? I wish to, just like the front fork, shift from a 622 rim (700c) to a 584 rim (650B). Any suggestion much appreciated. Perhaps a new frame but I have seen adaptors by about but don’t know the reputation.
sorry we have no such adaptors, there's no substitute for the correct thing!RT
01 May 2020
My aim is to fit a 622-50 Schwalbe almotion tyre With mudguard but if I have to move to 584-50 then this brake adaptor for 700c/650B use looks ideal. Only issue is I think the fork axis hub axis to crown axis is 435, and rake is more on the Thorn fork. I can not work out how this all affects significantly? geometry and final position once I’m seated riding.
Does SJS have a diagram of geometries? I’m not sure wheee your L1 from Crown starts. In comparison, VSF Farhaad state the fork length is 435 for the T-900. If so it means the fork here has less clearance it seems for tyres and mudguards? Page 19 here from a 2012 catalogue has the model, please note the fork is aluminium. https://issuu.com/goldbachhosting/docs/vsf_katalog_2012_lr/1?ff
if you need 435 then this fork is L1 Dimension (Axle to Crown Race Seat): 390mm this will significantly lower your head and make a steep head angle and possibly even bring the b/b too near the ground. The steering would be poor, if you need to continue this discussion it would be better by email ([email protected]) or phone +441278441522 RT
Can I use this with Magura HS11, strength wise? Great idea the reversible brake boss!
29 Apr 2020
yes, should be fine RT01/05/2020
Can I use this with a bike (VSF T-900) that the OEM maker adopted a 52 offset in its fork?
29 Apr 2020
I think 52 is most faithful to 50 and not 55.
Probably, on this fork L1 Dimension (Axle to Crown Race Seat): is 390mm, IF your bike is longer (I can't tell from the photo) then the head angle will get steeper so a fork with a little less offset than you have would be indicated. RT 01/05/2020