who could make a special part?
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who could make a special part?
I have a project ive been collecting parts for . its a gitane track bike. it has a mix of mavic ,shimano ten pitch , and forged campy seat post. my need is a special made lockring .it has to be like the ten pitch ring, but in French threading . this bike has ten pitch drive train on mavic rear hub . Ive acquired the standard thead ten pitch cog to go on the mavic rear hub, but a standard French lockring wont let the chain seat properly onto the cog. any ideas who might be able to make me a lockring that could work?
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Even a simple part like this can be very expensive to have made commercially. A hobbyist could make one provided he has the ability to generate the thread, since a tap for the job would be prohibitively costly (if it can be found).
I suggest you DIY using your existing lockring. It has the right thread, so it's a fairly simple matter of turning, filing, or grinding down the OD to clear the chain, then cutting a notch so it can be tightened.
I suggest you DIY using your existing lockring. It has the right thread, so it's a fairly simple matter of turning, filing, or grinding down the OD to clear the chain, then cutting a notch so it can be tightened.
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could I rethread a pitch ten lockring? how expensive a job are you thinking it could be ?
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If you're going to have one made, it's probably easier to start from scratch working on the end of a bar stock nub, boring the ID beyond the ring's thickness, threading that, turning the OD then parting it off. That has a complete lockring done in a single fixturing, except for the notches which can be added later.
It can be made from an air hardening grade of stainless steel, so you get a solid quality finished part. Unfortunately, it's probably cost about $100 or so.
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a hundred bucks or so would be nothing . I have no metal working knowledge except of listening and reading of what you just described.id pay more if I had to. nothing on this build has been cheap or easy to get for that matter . I bet not many of these bikes were sold . and either mavic , who I suspect ,or shimano had to been the ones to make the special lock ring . never seen it in a French size only the proprietary shimano size and English in a catalog. I have a shimano proprietary ring . I haven't the faintest as to who I could contact to do this .
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a hundred bucks or so would be nothing . I have no metal working knowledge except of listening and reading of what you just described.id pay more if I had to. nothing on this build has been cheap or easy to get for that matter . I bet not many of these bikes were sold . and either mavic , who I suspect ,or shimano had to been the ones to make the special lock ring . never seen it in a French size only the proprietary shimano size and English in a catalog. I have a shimano proprietary ring . I haven't the faintest as to who I could contact to do this .
If you want more help from me, please post a close up photo of the hub with the sprocket and lockring on.
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how hard would it be to mill the lockring on this down to make its OD diameter smaller and then deepen the notches a little ? the chain wont properly seat on the cog with the standard mavic lockring as shown. this is a 15 tooth cog, standard mavic 33x1 lockring.
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here is the size difference between a standard cogon the left and the ten pitch on the right. its a 15 tooth compared to the 14 tooth standard cog. thought I would post this so everybody checking out the thread could see the size difference between the two.
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Remove the lockring, and wrap a chain around the sprocket to determine the require OD. Reduce that by another millimeter or so, for a margin of error, and call Luke Shirk, at Shirk's bike in East Earl, PA. Tell him I said hello, and ask for a quote before mailing the ring to him.
BTW- I know the sprockets are rare as it is, but if you found a 16t sprocket that would solve the problem.
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An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
Last edited by FBinNY; 06-07-14 at 08:38 PM.
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yeah I found this one in Australia, cost me a 100 spot. had to wait on ebay awhile = 1 1/2 years for a standard thread to come up ,then another year for a front 80mm hub to come up , got that one from Portugal. those have been the hardest parts so far to get . the mavic stem ive never seen before. the seat post is a forged sr campy . im trying to put it to catalog specs.