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7-speed cassette on a 8/9spd hub?

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7-speed cassette on a 8/9spd hub?

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Old 10-17-06, 08:06 PM
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7-speed cassette on a 8/9spd hub?

I need to replace my 7=spd cassette . after adding up cost of new casstt, tools to put it on etc, I was thinking it might be nice to just get a new wheel. I've no interest in replacing the 7-spd shifters.

I seem to recall hearing one can pop a 7-speed onto a 8/9 spd hub but need a spacer to line it up propely...is this true or am i on crack?

merci
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Old 10-17-06, 08:13 PM
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Need a $3 spacer.
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Old 10-17-06, 08:18 PM
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Cool!

ThanKs Phil - does it go on the inside or outside? (or do i just need to play with it to get optimal chainline?)

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Old 10-17-06, 08:20 PM
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Goes on first. Too thin to have much impact on the chainline.
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Old 10-18-06, 04:46 AM
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After installing spacer and casette, you may need to adjust your limit screws on your rear derailluer.
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Old 10-18-06, 06:08 AM
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Old 10-18-06, 06:36 AM
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that's great - thanks so much everyone!
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Old 10-18-06, 07:10 AM
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The spacer may not go on first if the bolts or rivets holding the cassette together interfer with seating the cassette. You either have to remove the bolts or install the spacer to the outside of the small cog.

I did the latter, installing the spacer between the small cog and the lockring, and it has worked just fine.
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Old 10-18-06, 09:37 AM
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I did this recently too, but there was already a metal ring with a rubber seal on the freehub body. I used the 4.5 mm spacer instead of the existing ring and it worked perfectly. I didn't have to adjust the limit screws but did have to adjust the cable tension.
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Old 06-12-07, 08:27 AM
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sorry to revive this old dog - I am gonna try this now (decided to keep the old wheel - this is for my older bike).

Assuming I put a 7spd cassette (Shimano Hyperglide) w/ spacer on a new 8/9 spd wheel (Shimano) and my bike is a mid-80s road bike that came with a 6 spd Shimano freewheel, will I have any issues?

It has friction shifters and the rear can handle the wider axle spacing (I stuck the 9 spd rear wheel from my 2003 bike in there no problem, though the bike's 6spd chain obviously was too wide to fit the wheel's narrower 9spd cogs).

The bike has new Stronglight chainrings (53/39, for modern 8/9 spds) so no worries there I can see. The original 6spd chain has some minor stretch but is still okay. Would I need to change this or is it okay to run it awhile and swap a new chain in a bit down the road? (The 7 spd cassette is not new, and the Chain rings have about 1000 miles on them).
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Old 06-12-07, 08:33 AM
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You should be fine, most 6s chains are advertised as 6/7 compatible. Since you're running friction anyway, just put an new 8s cassette on there (available pretty cheap last I checked ebay) and a new SRAM-58 chain and be happy. Your chainrings will last longer with a new chain, too.
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Old 06-12-07, 09:12 AM
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Thanks

I hear you on the new cassette but I just laid out $200 for a new cassette and three chain rings and chain for my mtb - I stuck a 13-23 on that for road use, as the original uber low gears were kinda useless once I no longer used the old girl on dirt.

The mtb's original cassette is 13-30 and I was looking to get a new rear wheel for my old road bike. as the teeth are still pretty good on the old cassette's cogs, I thought I'd just get a new wheel for $60 or so on Nashbar's site and slap it together.

The 6-spd freewheel is in real good shape but the wheel itself is nothing special. sealed Malliard hub, Rigida rim. I am thinking a new Freehub may be a bit more reliable and smooth. eventually I'd replace the chain and cassette on the old road bike with a 8 or 9-spd, though!
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Old 06-12-07, 05:17 PM
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Originally Posted by pgoat
Assuming I put a 7spd cassette (Shimano Hyperglide) w/ spacer on a new 8/9 spd wheel (Shimano) and my bike is a mid-80s road bike that came with a 6 spd Shimano freewheel, will I have any issues?
Probably. Typical dropout spacing for 6-speed freewieels was 126mm. 8/9-speed hubs will be spaced for 130mm dropouts.
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Old 06-13-07, 09:16 AM
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well, as far as axle clearance goes, it looks okay - as I mentioned, I was able to install my 9 spd wheel and it fit and spun freely when locked down. If anything, there is too much space when I install the stock 6spd wheel (Perhaps someone already coldset the frame for a 130mm axle? Doubtful since it had the original wheelset and was 100% stock when I bought it used.)

I was thinking since it has friction shifters that I would only need to perhaps adjust the limiting screws to accomodate the spacer and ensure the chain doesn't exceed the cogs at either end.
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