Accessories Bicycles Parts Specials Tools
bicycles  bicycle parts  spare parts  bicycle chain  chains hub  hubs  crank  crank set  crankset  arm  bottom bracket bottom  bracket  derailleur  front  derailler  derailure  rear  derailer freewheel  sprocket  cog  freewheel cogs  casette cogs  cassette hub  freehub  free hub  axle  index  grip shift  gripshift  rapid fire  shiman  campagnolo  sachs  sram sedis hyperglide  hyper glide  superglide  super glide ig  hg  sg  biopace bearing cartridge

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

spoke

"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.

divider

Click Here for Other Chainring Bolt Patterns

divider
American/OPC Bottom
Brackets
Brakes
Brifters Cables Calipers Levers D U Shoes
Brooks
Saddles
Car Racks Cassettes
7 8 9 10 Body
Chains
3/32"
1/8"
Chainwheels Cranks
Fx 11 13 117 137
Derailers
Front Rear
Drivetrain
Parts
English
3-speed
Fixed-Gear Headquarters
Chain Cog Crank Hub Wheel
French Parts
Brakes   Cranks  Info
Freewheels
1 5 6 6U 7 8
Groups
& Kits
Handlebars Handlebar
Stems
Handlebar
Tape/Grips
Headsets
Hubs and Hub Parts
Brake   Fixed   Internal-Gear   MTB   Road   1-speed   Tandem
Lights Pedals Rims Saddles &
Seatposts
Shifters Singlespeed
Stuff
Stems Three-Speed
Parts
Tandem
Parts
Tires,
Tubes, etc.
Tools Wheels
Articles by Sheldon Brown and others
Harris
Home
Beginners Brakes Commuting
Lights
Cycle-
Computers
Do-It-
Yourself
Essays
Family
Cycling
Fixed Gear
Singlespeed
Frames Gears &
Drivetrain
Bicycle
Humor
Bicycle
Glossary
Bicycle
Links
Old
Bikes
Repair
Tips
Tandems Touring What's
New
Wheels Sheldon
Brown

Feedback? Questions?

divider

We also have a page of selected links

divider

This site was established December 4, 1995...

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

Web site by Sheldon Brown

Ordering Feedback? Questions?

URL: http://harriscyclery.com/64

Copyright © 2005, 2007 Harris Cyclery