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Is this do-able and safe (assuming the narrower section of the nut can enter the fork from the rear)?
The fork wants a nutted caliper I don't have. The caliper's bolt will get threaded by 15mm of nut so more than it would have had with a nylock nut on the outside, and the 2 washers fit snuggish and are decent i.e. they shouldn't get pulled through.
Any thoughts? Thanks in advance.

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Another well priced Thorn - a badly listed XTC in Redditch on Gumtree. £400 for superb, fillet brazed 26" tourer. Just one photo at a distance but looks tidy.
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Great, thanks @psb and @Brommers - just to check, if the rear derailleur cable is unsealed then pegging the dynamo cable to it whether via zip-tying/heatshrinking is ok, the movement doesn't bother it over time? Suppose best to make sure slack either end?
Not sure I can run inside the mudguard as the folded edges are sealed at the ends + the guard starts well below the BB and ends well after the light fitting on the rack so would be a lot of doubling back/saggy loops unless I drilled early entrance/exit holes. But I could ziptie/heatshrink piggyback along the RD cable along the driveside chainstay then possibly up the rack leg (once I've thought about whether drilling a hole would be ok. It'd have to be 3mm diameter, not insignificant...)
And thanks @Sergeant_Pluck - those links are very helpful and I didn't know about coloured zip ties which would be good. Cheers too for the micro tube, not sure at the moment - where did you use yours?
Edit, just read a discussion on the CTC forum about drilling into a Tubus rack (albeit a Ti one). Consensus is bad idea. Also hadn't thought about rubber grommets to stop the rubbing so a 3mm hole becomes at least 4mm for the grommets+cable and that seems way too much for a fairly minimal rack.
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Any advice re cable routing would be very helpful, thanks.
First dynamo set up, for girlfriend's bike that gets parked in public quite a bit so needs to be fairly robust. No obvious options for running things internally (except rack, see q below). She locks up via seat or top tube so have opted for a path via downtube.
Start: BM Cyo N Plus (standard bracket), finish: rack-mounted BM Toplight. I've added (too) small numbers where I've got particular questions

1, 2 & 3- is running it through the spare downtube cable adjuster braze-on (1) around the bottle lugs (2) or bottom bracket guides (3) useful or will that just fret the cable in time?
4 - the Tubus rack leg is open at the bottom so drilling a hole at the top would let me run it through and get it out of the way of bags - is this ok to do?Also, I have no real clue as to how many loops round the downtube I should do and if anyone can point to a comprehensive idiot's guide to cable routing, I'd love to see. Easy to overthink this and perhaps I am but have spent a bit of time here and elsewhere but haven't seen anything Sheldon-like in basics + detail.
Thanks all.
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Building my first dynamo-hubbed 700c wheel, likely a 32 hole SP PV-8 to a Kinlin XM-250 (both from Spa, £73 + £30), 3-cross with Cyclebasket's ACI or whichever db spokes.
To check.... are there any special building considerations because it's a dynamo hub?
If anyone knows of low priced improvements on the above choices, I'd be grateful to hear.
Thanks!
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I'm putting a fork with an uncut carbon steerer on a bike for the first time and want to play around with the stem height. It's got a bung now (50mm approx) but 90mm or so would be good, i think - something like this:

Anyone have one cheapish? Could also swap for the one I've got in there though not sure how this would benefit you though I have a ton of degreaser and random parts I'd be happy to exchange too.
Thanks.
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Thank you, much appreciated! I cycled round a few LBS's yesterday for just this thing (no luck) so good to know they have it, cheers.