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Upgrading from 7 sp triple to 9 sp double
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by VK on February 11, 2002
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Can anybody help me with upgrading from 7 speed triple to a 9 speed double?
I think I need to replace the following. Please let me know if I left something out. Thanks
double crank, 9 speed shifter (bar end or sti), 9 sp rear derailer.
also, how can i tell if frame on my road bike is aluminum or steel. it's a Diamondback Interval (it maybe several years old - bought it used) and it seems pretty heavy. it's got shimano rsx stuff on it. thanks
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RE: Upgrading from 7 sp triple to 9 sp double
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by runbikejeff on February 11, 2002
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Besides the crankset, rear derailleur and shift levers, I think you may also need a new bottom bracket spindle, since the axle for a triple is longer to accommodate the extra chainring. As for determining whether your frame is steel or aluminum, just use a magnet. Unless you live in a parallel universe, a magnet will not be attracted to aluminum.
I don't know how much you are willing to spend on upgrading this bike, but if you check around - ebay, for example, or on the duathlon.com classified section (a much wiser choice!),you may be able to get a better deal on a newer bike, and still have your current bike for training. Good luck!
Jeffrey Timm
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RE: Upgrading from 7 sp triple to 9 sp double
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by GREGDOGG on February 11, 2002
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Depending on how old the bike is, you may not be able to upgrade to 9 speed. Older bikes have a smaller spacing at the rear axle. I had a friend run into this problem when he purchased an older model Greg Lemond(Calfee). It took a couple of people and alot of force, just to get an 8 speed wheel into the dropouts. I don't recommend this. If the bike does have the required spacing for 9 speed, you will also need a new rear wheel. A Shimano 8 or 9 speed rear hub is needed to run 9 speed.
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RE: Upgrading from 7 sp triple to 9 sp double
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by KIWINICK on February 11, 2002
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Jeff, easy with the parallel universe stuff. You could offend a lot of us who frequent duathlon.com.
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RE: Upgrading from 7 sp triple to 9 sp double
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by ALLEZJOHN on February 12, 2002
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IF the frame is steel and the rear dropout spacing is 126mm [like many older 7speed road bikes], Then putting in a hub with 130mm spacing [aka modern shimano 8/9speed hubs] won't be too much of a hassle. Just gotta do one side at a time. IF the frame is aluminum, which is more brittle than steel, then I would be a LOT more hesitant to shove in the larger spaced hub. My cyclocross bike is an old old steel Bertin which has 126mm rear dropout spacing. But because I'm somewhat of a high-tech redneck, I've got a shimano 9speed hub/cassette setup in it. Of course with a single 44t chainring up front...
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RE: Upgrading from 7 sp triple to 9 sp double
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by VK on February 12, 2002
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Thanks everybody for the input. I've also got the some input from another site. It looks like i'm going to keep the bike as is and buy a new bike in a couple years when my finances are in order.
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