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Alternative chainrings for shimano drivetrain...(4 posts)

Alternative chainrings for shimano drivetrain...dawg
Apr 1, 2002 3:11 PM
I have shimano 105 components and was interested in switching fro 53/39 set-up to something like 48/34, perhaps. I can not find where shimano produces replacement chainrings other than the standard 53/52/39/30 rings.

How compatible are chainrings from other companies? I notice Cambria.com carries "Real" and "U.S. Made" chainrings to fit 130 mm. Would that fit on my cranks?

I appreciate the help.
No prob; all you need to know is the BCDretro
Apr 1, 2002 4:46 PM
They're hugely interchangeable if you match the Bolt Circle Diameter, but (assuming you have a double chainring), I think 39 or 38 is as small as you can go (sorry--both my road bikes are Sugino triples, and I don't remember the specifics on Shimano). If you get a Nashbar catalog, it spells out very carefully how to figure out what you need.
FWIW, I've been running a 46-36-26 triple for a couple of years, and it's much better suited to most people's ability (well, at least my ability) than a 53-39.
re: Alternative chainrings for shimano drivetrain...LC
Apr 1, 2002 5:22 PM
If the chainrings are for 130 B.C.D. then they will fit. I think Colorado Cyclist may have other aftermarket rings too.
Right, but as noted,Ray Sachs
Apr 2, 2002 11:11 AM
you can only go down to a 38 with Shimano's 130 bcd cranks. You can get a third party 110 bcd crank though and use it with an otherwise all-Shimano drivetrain to achieve the 48-34 you're looking for. I have this on my Merckx, with all Dura Ace but an old 110 bcd Ritchey double crank with that chainring combo. With a 12-27 in back, it gives me a much more useful set of gears for my strength level than the racing gearing that comes standard. And I can avoid going to a triple.

The only thing to watch out for is if you have a braze on front derailure - you probably won't be able to get the derailure low enough to work with the smaller rings. No problem with a clamp on though.

-Ray