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64 mm BCD Mountain Chainrings from Harris Cyclery

Shimano Authorized Internet Dealer
For more technical detail see the B.C.D. entry in Sheldon Brown's Bicycle Glossary

64 mm bolt circle Shimano XT, LX 4-bolt inner

64 mm 4 bolt chainrings from our Quality Special Order Catalogue

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"9-Speed" Chainrings

There is a lot of confusion about the compatibility of narrow 9-speed chains with older cranksets. Shimano says you should replace the inner chainring(s) with specially designated 9-speed ones, but then they're all too eager to sell you stuff, whether you need it or not.

Shimano is also concerned about clueless users. The worst-case scenario is that you will be riding along with the bike in its highest gear (large front, small rear) and then for some bizarre reason shift down in front before downshifting in the back. (There is no shift pattern in which it is reasonable to shift in this sequence.) If you do shift this way, there's a small chance that the chain might "skate" over the edges of the teeth for maybe half a turn.

In practice this "problem" almost never materializes. Many, many cyclists are using 9-speed chains with older cranksets and having no problems whatever.

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Click Here for Other Chainring Bolt Patterns

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This site was established December 4, 1995...

We were the first southern New England bicycle shop with a Web site!

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URL: http://harriscyclery.com/64

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