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Post by paulrobbo1 on Feb 7, 2015 21:07:17 GMT
Hi all. I'm a Newby with a newly aquired 250. It needs a bit of final putting back together but came with no chain. Looking on ebay there appear to be two sizes for a 1979 model. How do I determine which one I need without one to compare. Cheers. Paul
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Post by grahamb on Feb 7, 2015 21:28:48 GMT
Hi
If your talking about the difference between the "520" and "530 sizes of the chain, you need to check your sprocket width..
520 = is about 1/4" ( 6.00mm) and the 530 = is about 3/8" ( 10.00mm) . the pitch is the same 5/8" (16.00mm)
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Post by paulrobbo1 on Feb 7, 2015 22:02:12 GMT
Hi and thanks for the quick reply. Is that the front or rear or both. Cheers. Paul
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Post by scott on Feb 7, 2015 22:23:39 GMT
front and rear sprocket need to be the same width Paul
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Deleted
Deleted Member
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Post by Deleted on Feb 8, 2015 1:15:08 GMT
Just to add, your bike would have had a 530 from new.
Cheers
FB
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Post by paulrobbo1 on Feb 8, 2015 8:09:31 GMT
Thanks all. I'll check today and order one. Paul
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Post by paulrobbo1 on Feb 8, 2015 10:17:29 GMT
Well its about 6-7mm so a 520 it is.......I hope  ? Thanks again |
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Post by grahamb on Feb 8, 2015 11:17:09 GMT
Well its about 6-7mm so a 520 it is.......I hope ? Thanks again Hi the blanks the sprockets are turned from are normally 9-10 mm and they turn the outer edge down to about 6.00 mm to achieve the 520 size. so there should be a ridge of about 1/16" ( 1.50 mm) visible on each side near the rim. Not 100% sure if all manufactures are the same. in other words measure twice pay once  |
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Post by paulrobbo1 on Feb 8, 2015 16:13:35 GMT
Hi Graham. Sound advice which I took. There is no lip but I put an adjustable spanner on the sprocket and it is indeed just under 10mm so I need a 530 which another post said I would. The teeth go slightly smaller on the edge to about 8mm.
Glad I went back and checked.
Paul
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Post by Harold on Feb 9, 2015 9:22:44 GMT
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Post by paulrobbo1 on Feb 10, 2015 15:22:43 GMT
Thanks Harold. Just bought a chain from David Silver so hopefully it will all be fine. Paul
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