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from a 53T to a 46T outter ring on a 105 crankset.(9 posts)

from a 53T to a 46T outter ring on a 105 crankset.jrm
Dec 28, 2001 8:31 AM
The 46T is a TA brand ring thats pinned and ramped for a 9 spd double. At the same time i bought a 105 front derailler. The LBS is telling me that if i switch the existing 53T for the 46T ring that without using a MTB front derailer my shifting will suck. So is this crap or do i need to change deraillers?
LBS is wrong...Cima Coppi
Dec 28, 2001 8:44 AM
You can certainly use a road front derailleur on a crankset with a 46T outer ring. They do this cyclocross all the time. You will need to lower your derailleur on the seat tube to maintain correct clearence between the derailleur and the outer ring.

Good Luck

CC
Worked for me, and I like the new gearingcory
Dec 28, 2001 9:01 AM
All I had to do was slide the derailleur down the seat tube a little to line up with the new ring. And I love the new gearing--it gives a lot more usable ratios without losing anything I needed (I'll confess--anytime I can turn a 53-12, I'm going to be coasting anyway).
re: from a 53T to a 46T outter ring on a 105 crankset.jrm
Dec 28, 2001 11:22 AM
Thanks guy's. it seems that the build of my bike is costing me more than expected due to these little problems the LBS is encountering in finishing the build.

Think its time to find another LBS.
I'd give him a little bit of slacknee Spoke Wrench
Dec 28, 2001 12:24 PM
There are a lot of things that I'd do on my own personal bike that I'd be hesitant to do on a customer's bike.

My experience has been that customers feel they are paying good money for my knowledge and expertise and consequently they expect everything to line up right and look right. A derailleur cage that doesn't match up to the arc of the chainring might not bother some people, but I'd definitely want to talk about it with my customer beforehand.
Just a little......jrm
Dec 28, 2001 3:22 PM
They just did a build for me that has turned out to be $180. This after i hung all the components and took the bike to them to install the BB and run cables.

When i asked if they would adjust the FD to the new ring they said that they would have to charge me for a 2nd FD adjustment and fitting the ring. I told them i didnt know if i could afford them any longer.
Just a little......jrm
Dec 28, 2001 3:22 PM
They just did a build for me that has turned out to be $180. This after i hung all the components and took the bike to them to install the BB and run cables.

When i asked if they would adjust the FD to the new ring they said that they would have to charge me for a 2nd FD adjustment and fitting the ring. I told them i didnt know if i could afford them any longer. some how i feel taken...
Good point. How about a mountain derailleur?cory
Dec 28, 2001 3:34 PM
I should have mentioned this in my previous post, but it's been awhile since I made the swap and I forgot: When I used the existing road der., it shifted fine, but there was a sort of tacky mismatch between the arc of the cage and the arc of the new ring. It slipped my mind that I put on a Shimano LX front derailleur, which matched the arc of the 46t ring and ALSO shifts fine. Sorry.
Mtn. Bike DerailleurChen2
Dec 29, 2001 10:53 AM
I don't know much about mtn. bikes but I think all of the front derailleurs are of the clamp-on type. Wouldn't want to put a clamp-on on a carbon fiber frame or on a super thin aluminum frame. But if this bike can accept a clamp-on designed for a 46T ring, I would think that would be the better way to go.
-Al