8 speed wheel, 7 speed cassette
07-20-18, 08:47 AM
#1
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8 speed wheel, 7 speed cassette
I have an 8 speed wheel, 7 speed brifters. Any thoughts about using 8 speed cassette vs 7 speed and spacer? Its a touring bike, and the 8 speed gets me a 34t, the 7 speed a 32t.
Not likely to use the small gear much when loaded up
Not likely to use the small gear much when loaded up
07-20-18, 08:58 AM
#2
Banned
put an 8 speed cassette on and screw the H stroke limit screw on RD in and you have 7
older uniglide screwed 1st cog on, holding the cassette together, now its all lockrings...
face of 1st cog is knurled to stay tight with matching knurled lock ring , you have to keep it..
...
older uniglide screwed 1st cog on, holding the cassette together, now its all lockrings...
face of 1st cog is knurled to stay tight with matching knurled lock ring , you have to keep it..
...
Last edited by fietsbob; 07-20-18 at 09:03 AM.
07-20-18, 09:08 AM
#3
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What Bob said. Use the 8-speed cassette but set your low limit screw so you can't shift into the smallest gear. 7 and 8 speed spacing is close enough that you can use either or with some chatter every once in a while. I have 8-speed indexed bar end shifters with a 7-speed cassette on one of my bikes.
07-20-18, 09:25 AM
#5
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Chainline differences?
07-20-18, 09:43 AM
#6
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Measure for yourself.
chainline is from center of cluster, space between cogs if number is even..
move the crank set, with a different spindle, in or out if you want..
....
chainline is from center of cluster, space between cogs if number is even..
move the crank set, with a different spindle, in or out if you want..
....
07-20-18, 03:02 PM
#7
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How picky are you?
8-speed and 7-speed cassette spacing are a skosh different. Not a lot different, but a little bit. That means the index shifting will always be a skosh off. Many people have attempted what you are proposing and many of them are satisfied with the results. Personally, I've never been able to get that combination to work for very long to my satisfaction so I don't even mess with it anymore.
The people who say it works perfectly for them are either better tuners than me, less picky than me, or liars.
8-speed and 7-speed cassette spacing are a skosh different. Not a lot different, but a little bit. That means the index shifting will always be a skosh off. Many people have attempted what you are proposing and many of them are satisfied with the results. Personally, I've never been able to get that combination to work for very long to my satisfaction so I don't even mess with it anymore.
The people who say it works perfectly for them are either better tuners than me, less picky than me, or liars.
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07-20-18, 03:49 PM
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Chainline will technically be off just a little for a 7 speed, but no real consequence unless you want to better balance it out when running big-big. I'm too particular to run 8 spacing with 7 speed shifters. I run 7 speed cassettes with 8 speed shifters on my mountain bikes and re-space them. But that is easy since I just thinning out the spacers.
I was going to suggest just getting a non-mega HG-50 7 speed with a 34t, but it appears that they are not as easy to find as when I stocked up on them. I still see a few places with them. The gearing is 13-15-17-20-24-29-34. I like the 2 teeth for the first 3 and the 5 teeth for the low end.
John
I was going to suggest just getting a non-mega HG-50 7 speed with a 34t, but it appears that they are not as easy to find as when I stocked up on them. I still see a few places with them. The gearing is 13-15-17-20-24-29-34. I like the 2 teeth for the first 3 and the 5 teeth for the low end.
John
07-22-18, 07:25 PM
#10
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Thread Starter
Got it all set up. Man, not much leeway on this. Had to move deralleur up so inner cage cleared my middle ring. Can't seem to dial in my fine setting, getting rubbing on big and small ring, adjust one, lose the other. I have used an old RSX in the same set up with no problems. Thought the Deore XT would be better. Scratching head and nards, thinking......
