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Old 09-06-10, 05:44 AM   #1
adlai
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Replacing a 50t chainring with a 48t

from the bike website, this is my front crank: TruVativ Touro Cross aluminum arms, TruShift 36/50T Chainring, 110BCD

Want to replace the top-end 50t ring with a 48 or even a 46.

http://cgi.ebay.com/Sinz-48t-Expert-...item439f4bf1b5

or this

http://www.niagaracycle.com/product_...ucts_id=404395

would those work? I'm thinking b/c 110 BCD.

I've never done anything like this...tips?
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Old 09-06-10, 07:06 AM   #2
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I'm thinking it should be pretty much a straight bolt up. You'll probably want to lower your front derailleur just a skosh. You'll get slightly better shifting if your new chainring has "shifting aids" built into it. Your small chainring is probably just a flat ring now so you shouldn't have to worry about whether they match.
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Old 09-06-10, 11:48 AM   #3
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Quote:
Originally Posted by Retro Grouch View Post
I'm thinking it should be pretty much a straight bolt up. You'll probably want to lower your front derailleur just a skosh. You'll get slightly better shifting if your new chainring has "shifting aids" built into it. Your small chainring is probably just a flat ring now so you shouldn't have to worry about whether they match.

I think the original Touro crankset had shift pins on the outer chainring, so you might notice slightly worse shifting action. I doubt you'll notice the change after the first day, though. If it does become a problem, 48-tooth, 110mm bolt pattern chainrings with shift pins are available:
http://harriscyclery.net/product/fsa...r3952-qc49.htm
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Old 09-06-10, 11:54 AM   #4
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your LBS can supply an aftermarket chainring to suit your needs ,
Retail shop, Harris orders from QBP,
( the wholesale distributor , that supplied that picture)
and so can your local shop.. most have a QBP account.
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Old 09-06-10, 01:48 PM   #5
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If your front derailleur is a braze-on type there could be a problem getting it low enough.
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