Bicycle Mechanics - Middle chainring (Deore LX) for a 1994 Cannondale T700

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fopianki
12-04-10, 01:36 PM
Hi folks, I commute to work on my trusty 1994 Cannondale T700 touring bike. After noticing some skipping when pedaling while on the middle chainring I noticed that there are several teeth either worn down or broken. This is a 5 bolt, 32 teeth chainring for a Deore LX. Hard to measure the Bolt diameter with a 5 bolt pattern. My LBS said to bring it down and they will look at it and then order the correct chainring. This is a problem since I'm currently restricted from driving due to a recently diagnosed seizure disorder. (Yes, I'm allowed to ride my biKe! :eek:) Does anyone know where I could find the correct chainring order online/ If necessary, how should I measure the diameter? thanks Frank

JanMM
12-04-10, 01:49 PM
I put a '93 LX crankset on a '94 C-dale hybrid and it was 110 BCD.
To measure for confirmation of the size: http://www.sheldonbrown.com/gloss_bo-z.html

Loose Screws has a good selection of rings.
http://www.loosescrews.com/index.cgi?c=Crank/Chainring&id=519832830230
hybridbkrdr
12-04-10, 05:35 PM
Just out of curiosity, if you have the correct BCD, does it make any difference if you have let's say a Sora crankset and you want to buy a Tiagra or 105 chainring? Will it still be compatible?

bikeman715
12-04-10, 06:09 PM
as long the BCD are correct no it doesn't matter who the mfg. is.
HillRider
12-04-10, 07:10 PM
Are you SURE the worn chainring ring is 32 teeth? A 110 mm bcd will not accept any chainring with less than 33T and 34T is far more common. If you truly have a 32T chainring, the bcd is smaller than 110 mm.
AEO
12-04-10, 07:26 PM
as long the BCD are correct no it doesn't matter who the mfg. is.

except campagnolo.
campagnolo 110BCD is a bit different on one arm, compared to the standard everyone else uses, for whatever reason.
operator
12-04-10, 07:33 PM
as long the BCD are correct no it doesn't matter who the mfg. is.

Actually it does. OP will probably get subpar shifting with anything other than a shimano ring. People need to understand that just because someone else makes a chainring you can bolt on doesn't mean it'll work as well as the crankset was designed. Not only that, the OP will also have to make sure that the rings are for the correct speed drivetrain anyways.
fopianki
12-06-10, 09:04 PM
Are you SURE the worn chainring ring is 32 teeth? A 110 mm bcd will not accept any chainring with less than 33T and 34T is far more common. If you truly have a 32T chainring, the bcd is smaller than 110 mm.
You're right...it was a typo...there are 42 teeth...my apologies for the confusion!