Thorn Cycles Forum
Technical => Lighting and Electronics => Topic started by: Fourpanniers on April 10, 2026, 04:01:36 PM
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I'm assuming that the double-threaded upper lug on the right hand fork of a Thorn Sherpa is for a bottle dynamo. If so, that would mean the dynamo fits behind the brakes/fork and is a "right side" dynamo fitting. Am I right in all this?
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My previous bike! I nearly cut that bracket off as I thought that it would never be used - as you say I think it is for a bottle dynamo and perhaps a headlamp.
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For many years,SJS Cccles carried a variety of bespoke brackets to fit bottle dynamos to these bosses. Still do!...
https://www.sjscycles.co.uk/dynamos/thorn-stainless-steel-sliding-dynamo-boss-for-thorn-forks-with-boss-type-1-tshape/?geoc=US
...and...
https://www.sjscycles.co.uk/dynamos/thorn-stainless-steel-sliding-dynamo-boss-for-thorn-forks-with-boss-type-2-lshape/?geoc=US
Some of us who run standard or dyno hubs use the threaded sockes to store spare bolts/machine screws. George (mickeg) used his to store spare SPD cleat bolts, as I recall. I do the same. On a spare pair of forks fitted to another bike, I used the bracket to secure a B&M USB charging unit. Very tidy, it looked made for the task! On another Thorn fork, I am in-process making a spork mount to go on those same bosses. Screws threaded in from the reverse side, wing-nuts with beeswax on the threads and a homemade stainless clip to guard against rattling loose.
... I thought that it would never be used...
Think of the possibilities! ;D
Best, Dan.