Shimanno Sc105 7 speed upgrade

bmarcel

Hi, I have a question and I hope someone can give me some advice. I have a Trek Alum. 1400 that I bought new in/about 1996. It has Shimanno SC105 components Mavic Wheels. Things are wearing out and I don't want to have to replace EVERYTHING at once. My question is...will a SC105 9 spd casset fix on my mavic weel. I cannot swear to it, but I assume that the free hub is also sc105. I know I will at least need to change the deraileur, casset, shifters. I can get a kit. I'll change the crank and front derailure later. I may consider getting ultegra, or dura ace instead of the 105. Can anyone tell me just how far this will go and if I'll need to change the freehub too? Is changing the Freehub a major deal?

Thanks for any adivce..

Benny Marcel

mtcolo

No offense intended but get a new bike! Your bike is seven years old and if you are actually wearing out components you obviously ride pretty frequently. So do yourself a favor and get a new ride. Even if its not brand new, get yourself a used bike thats been well maintained with better componentry. You will be much better off.

MidBunchLurker

You'll want to check your rear dropout spacing. In the days of 7 speed this was narrower, when they started making bikes with 8 and 9 speed they increased it. You may find, like I did with my 1994 Cannondale, that you can't fit a 9-speed hub in your rear drop-outs.

Solution: buy a new bike!

PS. Anyone want to buy a 1994 Cannondale 7-speed Shimano 105?

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www.nickcoyne.com

bmarcel

Well at this point a new bike is not an option. I cannot swing it at this point. Besides I like my Trek although its getting old. last year I put a carbon fork on it. I have since talked to a local bike mechanic and I can change the hub body from a 7spd to a 9spd. The chain stay has enough space to fit the 9 spd 130mm width. Of course then I'll need the cassette, chain, deraillure, shifters...etc. I believe I can leave the crank alone for now. I may need to change the outter chain ring. Anyhow this will cost a lot less than what I would want to buy new. then in a few years...maybe I can get a new one. Also the mechanic told me that this October may be the best time to do this since Shimano is coming out with 10spd Durace components and the 9spd stuff will get dumped on the market at firesale prices....we'll see

Benny

BugMan

You can try using the old crank and just replacing the INNER chainring, but be prepared - your front shifting MAY not be too crisp, in which case a new crankset & BB will be necessary.

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bmhosey

i did this with my 7 speed 105 Quantum. the axle length is different going from 7 to 9 speed hubs. you could force the larger hub, but I didn't want to do that. if your frame was steel, you could heat it up and reset the frame.

i got 9 speed ultegra sti shifters and a 9 speed cassette. remove one gear from the cassette and just install 8 rings. one of the clicks on the shifter will not be used. i also replaced the front chainrings and chain.

good luck.

-b