Thread started by 666 at 10.6.09 - 11:00 am

how do i choose which derailleur i need when building up a road bike at a co op?

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who many speeds?

which shifters are you using?

and...what does the co-op have laying around?



md2
10.6.09 - 11:02 am

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between 6-7-8 speeds it doesnt matter, the adjustment is made on the shifter itself. just stay within shimano/sram or campagnolo.

when you get to 9/10, the chains run a little thinner, and i think you can swap out the pulleys, but thats just more money than you want to put into it. just make sure you get the desired length cage depends on how big the difference is between your cogset and chainrings and dont confuse a mountain and road derailleur.



_iJunes
10.6.09 - 11:05 am

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whats the diff between mountain and road?
the valley bikery has a crate full of deraillleurs that i can go through



666
responding to a comment by _iJunes
10.6.09 - 11:09 am

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cassette your using....mainly

road bike dont use (usually) a 32-34t cog, so they dont need long reach cages...

just make sure your shifters are compatible first..

that will narrow down your options





md2
responding to a comment by 666
10.6.09 - 11:18 am

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Anybody ever run across a hack to turn a 7 speed downtube shifter into a 8 speed shifter? I haven't searched it or posted up a question about this before. Figured I'd ask the experts first.

I'm really temped to rip apart my shifter to see if it can be done.



User1
10.6.09 - 11:28 am

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oh so i should see how many gears the shifter can use and then match it up with the cassette / chain rings?

what if i have a 8 gear shifter but 7 gear cassette?



666
responding to a comment by md2
10.6.09 - 11:30 am

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If you're on a budget, shoot for a 8 speed setup. It's the most prevalent combo out there. Plus everyone wants 9 speeds and up.



User1
responding to a comment by 666
10.6.09 - 11:50 am

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What kind of road bike are you building up?
Does it have index or friction shifting?
What kind of cassette do you have?
Do you have any of this stuff already?

Judging from your questions, you'd be MUCH better off buying a used COMPLETE road bike on craigslist (there are bunch for less than $180 now that the summer's over) and then learning bike mechanics as you go, by learning how to tune it up, adjust the deraillers, set the limit screws, etc.

Going from zero to trying to cobble together a complete and working road bike using the random parts at a co-op might be a big project.

It IS doable, it'll just take you a fair amount of time to find all the right parts, and more time to get them assembled properly.

Good luck!





JB
10.6.09 - 11:54 am

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http://losangeles.craigslist.org/sfv/bik/1408391955.html

Seriously, buy this bike for $50, tune it up, win.



JB
10.6.09 - 12:04 pm

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User1..... what do you mean by a hack?

I know Mr. Rollerz did some work similar or exactly to what you are thinking about doing



sexy
10.6.09 - 12:52 pm

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yeah you can if you're using friction shifters. just adjust the minimum and maximum screws on the derailleur. if you have indexed shifters the shimano ones actually have a knob you can twist but i hate friction shifters.



_iJunes
responding to a comment by User1
10.6.09 - 12:54 pm

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wow thats a pretty good price for that bike.
i'm actually trying to help a friend build up a bike and it'll be good for me to learn this stuff too :)



666
responding to a comment by JB
10.6.09 - 1:09 pm

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This is index downtube shifters. I don't want friction shifters. I'm thinking you can put another indentation where there's already some on the shifters. Just ad another if there's room. I might just take it apart today and take a looksy.

@Dave, hmmmmm I'll have to talk to Rollers tonite, thanks.



User1
responding to a comment by _iJunes
10.6.09 - 1:16 pm

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