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06-03.-2006, 07:49 AM
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#1 |
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Registered User
Join Date: Apr 2004
Location: Perth (Basso), West Australia
Posts: 3,512
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Using 7 speed shifters with 8 speed cassette?
Using 7 speed shifters with 8 speed cassette, anyone doing this?
I have lady friend with a Giant Upland. It is fitted with 7 speed EF29 shifters and a 7 speed HG30 14-28 cassette. The bike is fitted with a TX71 crankset (28/38/48) however it is too slow. I have a spare 8 speed cassette 11-32, the top 7 cogs being 11-28, the overall spacing (7) seems to be the same for both cassettes, 32mm. This could save buying a new 7 speed cassette and make use a spare 8 speed MTB cassette. Comments? 
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Cheers, George. Last edited by gclark8 : 06-03.-2006 at 08:42 AM. |
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06-03.-2006, 10:41 AM
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#2 |
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Registered User
Join Date: Dec 2004
Posts: 196
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Re: Using 7 speed shifters with 8 speed cassette?
Should work, but chain might not be aligned perfectly in all gears. I've often swapped 7 speed and 8 speed wheels on bikes with 7 speed or 8 speed shifters, and each combination works to a degree. For the last couple of years or so on my commuter, I've been using 8 speed shifters on a 7 speed freewheel and it sounds like some gears are not quite perfectly aligned. I'm soon to upgrade that bike to an 8 speed wheel.
Anyway, it's easy to try it out and see. |
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07-03.-2006, 10:01 AM
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#3 |
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Registered User
Join Date: Dec 2004
Posts: 196
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Re: Using 7 speed shifters with 8 speed cassette?
Forgot to say that the 8 speed cassette won't fit on the 7 speed freehub. If you remove one cog, you might need a spacer instead. Not sure of the exact numbers, but check Sheldon Brown's site, he has all the details.
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07-03.-2006, 10:26 AM
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#4 |
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Registered User
Join Date: Apr 2004
Location: Perth (Basso), West Australia
Posts: 3,512
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Re: Using 7 speed shifters with 8 speed cassette?
Thanks for that info, I will go to his site and have a look. I may have to buy a better 7 speed cassette or dismantle one of the old 8s.
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Cheers, George. |
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10-03.-2006, 01:39 AM
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#5 |
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Registered User
Join Date: Apr 2004
Location: Perth (Basso), West Australia
Posts: 3,512
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Re: Using 7 speed shifters with 8 speed cassette?
Well, I'm glad I waited. The lady brought the bike over today and surprise, surprise, a 7 speed spin-on 14-34 Mega Range Freewheel!!
 I ordered a Shimano MF HG50 11-28 7speed freewheel from the LBS. 
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Cheers, George. |
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12-03.-2006, 03:43 PM
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#6 |
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Registered User
Join Date: Apr 2004
Location: Perth (Basso), West Australia
Posts: 3,512
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Re: Using 7 speed shifters with 8 speed cassette?
I decided to offer her a speed option:
a pair of 650c "training wheels", the Front, a Deep-V with a Conti Gator Skin, 650x23, the Rear, a road rim on a Deore hub with a Conti GP, 650x23 use the 11-32, 8 speed MTB cassette, the 32 tooth not selectable, this will make one horny ladies MTB/Tri-training bike! 
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Cheers, George. |
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