Maybe, maybe not, since the original chain may have been measured different ways. There is a chain length calculation formula which I never use,since I size chains on the bike with cassette installed.Maye someone else knows it. If the chain has much use on it, it may be a good idea to change it anyway. Middle line Srams work well and don't cost alot.Originally posted by tanggoman
I currently have an 11-23 9speed cassette and would very much like to change it to a 12-26 or 12-27 9speed cassette... Does this needs changing the chain too??!?
Originally posted by tanggoman
I currently have an 11-23 9speed cassette and would very much like to change it to a 12-26 or 12-27 9speed cassette... Does this needs changing the chain too??!?
Originally posted by daveornee
"The best technique for setting chain length is to thread the chain onto the large/large combination, without running it through the rear derailer. Mesh the two ends on to the large chainwheel so that they could be connected (outer link meets inner link), then make the chain one complete link (one inch) longer than that. In almost all cases, this will give the optimum length."
cut right from Sheldon Brown's web site at URL:
http://sheldonbrown.com/derailer-adjustment.html
If you chain was sized exactly this way, you will need a longer chain. As mentioned by another poster, you may want to change the chain if it is at all worn to get the best life and performance from your new cassette.
Originally posted by tanggoman
I bought the bike brand new and from there I've put on 400miles on it, and I lube it every week...
Originally posted by treebound
What kind of bike (model/brand), and what gearing setup does it have currently (double or triple rings on front, XT or roadie derailer in back)? This will help people help you better.
Originally posted by tanggoman
Thanks for all the reponse!
The bike's Giant TCR1 with a 39/53 front and 11-23 9speed rear. Hope this helps. Thanks.
Originally posted by treebound
Found this one on Giant's web site:
http://www.giant-bicycle.com/us/030...r=2004&bikesection=8834&range=150&model=10813
It lists a 39/53 on the front and a 12-25 on the rear. If your's is the same as this one then you may have a little trouble going bigger than a 25 tooth on the rear.
Originally posted by tanggoman
I think what you got was the 2004 models, mine is 2003.
http://www.giant-bicycles.com/us/03...r=2003&bikesection=8830&range=136&model=10647
The old 8 speed shimano stuff was speced for a 28 tooth and would handle more.Currnet shimano road RD are speced for 27 and handle more. Cage(arm) length has nothing to do with it. The B ension scwew ofthen deeds fiddled with .Originally posted by treebound
If you need to go bigger than a 25 on the rear then you may have chain and arm issues to deal with, worst case is you may have to swap out your deraileur, again depending on what you have on there now
That's the way to do it if one has the casette. He said he didn't.Originally posted by daveornee
"The best technique for setting chain length is to thread the chain onto the large/large combination, without running it through the rear derailer. Mesh the two ends on to the large chainwheel so that they could be connected (outer link meets inner link), then make the chain one complete link (one inch) longer than that. In almost all cases, this will give the optimum length."
cut right from Sheldon Brown's web site at URL:
http://sheldonbrown.com/derailer-adjustment.html
If you chain was sized exactly this way, you will need a longer chain. As mentioned by another poster, you may want to change the chain if it is at all worn to get the best life and performance from your new cassette.
Even though you shouldn't be, it happens. I'd hate to tell a guy 'it'll be fine' and then hear he trashed something. There is a way to size a chain so that it will handle the range of cogs/chainrings the RD was speced for. There is also a specific formula for the cogs chainrings being considered,if one 'just wants to know'. Guessing just does not pay in this case.Originally posted by drewski
personally, chainlength-wise, i think you're going to be fine, since you shouldn't be in the big ring/big cog combo anyways. if anything you're going to be one link off.
None of that matters.Originally posted by treebound
What kind of bike (model/brand), and what gearing setup does it have currently (double or triple rings on front, XT or roadie derailer in back)? This will help people help you better.
Originally posted by drewski
either way, the ultegra rear derailleur has a 27T max cog and 29T total capacity so a 12-27/53-39 is still feasible, but you may not get the big/big combo depending on your chain-length. and you shouldn't be in the big/big combo anyways. even the top couple cogs.
with your mileage thus far, chain-wear is probably not an issue. chains aren't too expensive though, but i'd swap the cassette out and then deal with the chain length if it becomes an issue.
WHY???Originally posted by treebound
If your's is the same as this one then you may have a little trouble going bigger than a 25 tooth on the rear.
I would not guess about it. Getting in the big cogs is a possibility. If nothing else I would stick the cassette on and with the bike on a stand try the big/big to make sure nothing gets ginked.In the meantime,I'll find the formula for determining chain length without the guessing, misinformation and speculation you guys are so prone to.Originally posted by drewski
either way, the ultegra rear derailleur has a 27T max cog and 29T total capacity so a 12-27/53-39 is still feasible, but you may not get the big/big combo depending on your chain-length. and you shouldn't be in the big/big combo anyways. even the top couple cogs.
with your mileage thus far, chain-wear is probably not an issue. chains aren't too expensive though, but i'd swap the cassette out and then deal with the chain length if it becomes an issue.
Every method of determining chain length is availabe at www.parktool.com in the repair and maintenance section, including the long and short versions of the formula. It's a good site to be familiar with.Originally posted by tanggoman
I currently have an 11-23 9speed cassette and would very much like to change it to a 12-26 or 12-27 9speed cassette... Does this needs changing the chain too??!?
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