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Upgrade 6 - 7 speed :o

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Upgrade 6 - 7 speed :o

Old 06-03-07, 06:34 PM
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bailcash09
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Upgrade 6 - 7 speed :o

Do I need new chainrings and cassette to go from 6 to 7 speed freewheel? The bike in question is and old 1984 centurion accordo, for those of you wondering why I have just 6 speed rear sprocket. Have an extra casste lyin around, thought I'd try adding a speed.
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Old 06-03-07, 06:37 PM
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Sorry no answer...

Maybe better asked in the Mechanics forum...
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Old 06-03-07, 06:47 PM
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bailcash09
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Good idea...sry
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Old 06-03-07, 06:54 PM
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cuda2k
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No. You don't need to change. 6 or 7speed will utilize the same crank/chain rings/crank/etc no problem. All you should really need to change is the shifters.
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Old 06-03-07, 06:55 PM
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clancy98
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and if they are friction, you donr have to change those either.
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Old 06-03-07, 07:03 PM
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bailcash09
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Ya old friction stem shifters. Gotta love a free upgrade
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Old 06-03-07, 07:05 PM
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I will have to change the spacers on axle though...old 126mm dropouts. Hopefully when I have added spacers i can fit the wheel in and it won't rub....idk
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Old 06-03-07, 07:07 PM
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What kind of 7-speed freewheel are you putting on ?? Something like SunTour's Ultra-7, that fits in the 6 speed sized frame dropouts ?? I did that years ago and it worked fine. On my Cannondale, I needed to add 1 washer the the freewheel side of the axle to make sure the chain didn't rub the dropout on the smallest cog. On a steel frame you probably won't need the washer because the steel dropouts had a tiny bit more clearance.
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Old 06-03-07, 07:10 PM
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When I switched from a 6 to a 7 on my Summit steel bike I had to remove the bolt-in stop in the derailleur side dropout, but that was the only adjustment necessary beyond tweaking the RD limit screws.
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Old 06-03-07, 07:11 PM
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Originally Posted by bailcash09
I will have to change the spacers on axle though...old 126mm dropouts. Hopefully when I have added spacers I can fit the wheel in and it won't rub....idk
Should be fine, just spread the dropouts a hair as you put the wheel in. Last year I put an 8 speed cassette on my old Cannondale, replacing the ultra-7. Worked like a charm. Used it with my old down tube shifters (no indexing in this case). I was considering putting an old 8 speed brifter on it to get the indexing feature, but ended up buying a 10 speed Cannondale off Ebay, and keeping the old bike for rainy days.
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Old 06-03-07, 07:17 PM
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Originally Posted by Homebrew01
What kind of 7-speed freewheel are you putting on ??
just a cheap one from an old project that i never used. Nothin special like that. I think it came off of a mtn bike, with 135mm spacin, so it probably isn't the suntour.
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Old 06-03-07, 07:19 PM
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Spin the new freewheel on the current wheel and see if it fits. I run several 7sp freewheels on 126mm spacing no problem. If anything you might need 1-2mm of extra space depending on the dropouts on your particular frame.
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Old 06-03-07, 07:20 PM
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(Moving thread to C&V where it should get more responses and input from those who currently use 6/7 sp gear)
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Old 06-03-07, 07:21 PM
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It's possible your axle won't be long enough to add the spacers you need. You can probably get a new axle at your LBS for a couple of bucks and swap it out. No big deal.
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Old 06-03-07, 07:24 PM
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bailcash09
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It might not be, especially since it is a q/r....I'll have to double check.
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Old 06-04-07, 08:05 PM
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Just finished - the original axle workes with 0mm to spare. It tooks some force to get the locknut off to change the spacers, but it's all good now .
Haven't had time for a ride but spun and shifted well when I checked it. thanks for the input
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Old 06-04-07, 10:47 PM
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How do you tell if your shifters are indexed? I'm looking to go from 6 to 7 speeds on my pug with DT shifters and I don't want to have to change shifters.

I'm guessing that they're friction shifters on my ph501, bu i'm not certain.

Homebrew, how'd you get it to go from 7 to 8 speeds? I thought that a 7 could easily be put in the place of a 6 speed freewheel, but I thought people ran into spacing problems with 8's. According to sheldon's site, 8's are supposed to be pretty problematic too, no?


I'm suprised that your hand spreading the dropouts worked. Lucky You

Originally Posted by Homebrew01
Should be fine, just spread the dropouts a hair as you put the wheel in. Last year I put an 8 speed cassette on my old Cannondale, replacing the ultra-7. Worked like a charm. Used it with my old down tube shifters (no indexing in this case). I was considering putting an old 8 speed brifter on it to get the indexing feature, but ended up buying a 10 speed Cannondale off Ebay, and keeping the old bike for rainy days.
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Old 06-04-07, 11:21 PM
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ridethecliche-
I think the difference between friction and indexed shifiting is that friction shifters will move smoothly through the range of the derailleur, while indexed shifters click into place at each gear.
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Old 06-04-07, 11:26 PM
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That's what I thought, then wohoo I have friction. 7 speed here I come! (In 6 weeks anyway haha).
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