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Upgrading from 7 sp triple to 9 sp double(9 posts)

Upgrading from 7 sp triple to 9 sp doubleVK
Feb 11, 2002 1:33 PM
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
re: Upgrading from 7 sp triple to 9 sp doubleslow-ron
Feb 11, 2002 1:50 PM
place a magnet near the frame. if it's steel the magnet will stick, if it's aluminum the magnet won't.

can't help you too much on the group switch but you forgot a chain & cassette.
re: Upgrading from 7 sp triple to 9 sp doubleVK
Feb 11, 2002 1:59 PM
thanks for the info
re: Upgrading from 7 sp triple to 9 sp doubleCT1 Guy
Feb 11, 2002 2:06 PM
Basically you need to replace the whole transmission - chainset, front and rear mechs, chain, shifters - and your you'll need a new rear wheel, or rebuilt rear wheel with new hub - plus a bottom bracket for the new cranks.

Unless you've got all the tools and the skills, reckon on about 4-6 hours bike workshop labor as well.

To be honest, bikes have come on a helluva lot in the last few years and you'll only be compromising the ride - changing the transmission isn't gonna make an old clunker into a well handling dialled-in machine.

Keep the old bike as a winter hack, save up your $$$ and buy a complete bike. It'll be about 5lbs lighter, better handling and it'll be something you'll look forward to riding.
ditto. nm :)Troyboy
Feb 11, 2002 2:09 PM
Will this guy's rear wheel work?Troyboy
Feb 11, 2002 2:07 PM
You might need a new wheel. I'm not a pro wrench, but I believe the width is different. You'll likely not be able to fit a 9 speed cassette on an old 7 speed hub. I also believe dropout spacing standards changed at this time. You should be able to spread the rear stays to get a wheel in there though.

Furthermore, you'll likely need a new bottom bracket because the spindle is a different length for triples and doubles. Therefore, BB, cranks, new rear wheel, cassette, rear der, front der (might as well), two new levers, chain, might as well do cables too at this point.

Might as well go get a new bike at this point. For a couple hundred more, you can get a nicely equipped almost full Ultegra bike at Supergo. It will be lighter, brand new, etc. At the end of last year, they were clearing Specialized and Cervelo at incredible deals.
re: Upgrading from 7 sp triple to 9 sp doubleVK
Feb 11, 2002 2:31 PM
thanks for all the feedback. it sounds like i shouldn't spend any money on my bike and save for a new one.
VK - wise decision. I agree.Troyboy
Feb 11, 2002 4:02 PM
I believe the end of year blowouts were around $1100. Truly an unreal deal.
'spose I'll make the "new jack hip fad" suggestion...Ahimsa
Feb 11, 2002 6:18 PM
...everyone makes 'round here these days and say:

"Why not make that bike into a single speed or fixed gear?"

There...someone said it.

Cheers!

A.