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Campagnolo Shifters - Shimano Spacing

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Campagnolo Shifters - Shimano Spacing

Old 05-13-15, 01:28 PM
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70sSanO
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Campagnolo Shifters - Shimano Spacing

I asked this in the Classic and Vintage, but I thought I would ask the mechanics here.

To cut to the chase, I am going from a 7 speed freewheel to cassette on my road bike and will be running an 8 or 9 speed cassette. Probably 8 speeds, With my age and the terrain I ride I have no interest in 1 tooth cog differences. The selection of shifters range from Dura Ace downtube, to low quality (2400/3500) shifters to Campagnolo 10 speed brifters, which may be the best route to go.

This subject has been discussed ad nauseam and I have read so many threads that go from... works great, to alternate routing to jtek. But what I haven't seem is what cassette spacing can be used to address Campagnolo's 10 speed variable cable pull. I have read the actual cable pull is 2.5mm (1st-6th), 3.0mm (7th & 8th), 3.5 (9th & 10th).

It seems to me that the best way to overcome variable cable pull is to run with Shimano 9 speed spacing over 6 cogs (5 spacers) and then go to Shimano 7/8 speed spacing over the last 2 cogs. I anticipate running a wide range cassette with an XTR 960 rear derailleur. I realize that it is low normal, but I am used to running that on my mountain bikes. If this spacing works, I can just go with a spidered XT 770 cassette and just have to re-space cogs 2/3. I would drop the 11t off of the 11-32 cassette and use a 12t normal first position.

Will this work?

John
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Old 05-13-15, 02:21 PM
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dabac
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Campy 10 shifter + Shimano derailer + Shimano 8-speed cassette, and Campy 9-speed shifter + JTEK +Shimano derailer + Shimano 9-speed cassette both run so clean that I've never considered tinkering with variable cassette spacing.
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Old 05-13-15, 03:11 PM
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FastJake
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Over the years I've setup at least six bikes with Campy 10-speed shifters and everything else Shimano 8-speed. I've never had a problem with the variable cable pull/spacing. To me it runs just as smooth as with a Shimano 8-speed shifter. And I am indeed sensitive to these sorts of changes. For example I was never satisfied mixing Shimano 7/8 speed shifters/cassettes as is sometimes said to be ok.
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Old 05-13-15, 10:06 PM
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Don't fall for the bs that gets repeated online... Campy, Sram, and Shimano all have "variable cable pull." I've measured them.

Don't over think it. 11 speed Campy pulling a shimano 9speed RD on a 9speed cassette is almost perfect. You just want to adjust the derailleur while in the middle cog to minimize any spacing issues on either end (negligible except for the 1st and last cog... and even then, you won't notice). Alternatively, you run Campy 10 to Shimano 8 on a shimano 8speed cassette. You absolutely DO NOT need to toy around with spacing with either combo.
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Old 05-14-15, 08:47 AM
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Thanks for the information. It is exactly what I was looking for.

Even though I am not a Sunrace fan, I think I will go with one of their 8 speed 12-34 that has individual cogs and weighs around 340g. I have been known to crack open a freewheel or cassette and customize it so it is not a big deal if I decide to take a few tenths of a mm here or there. I am currently running a 12-32 Sachs 7 speed with an XTR 950 derailleur and DA downtube shifters. I swapped out the 30t for a 32t and my 740X RD just didn't like the extra 2t. Surprisingly the DA RD worked with the 30t.

It's funny, even though I never ran a corncob, 25 years ago I would have laughed at the idea of having a 34t on my road bike. But the years have slowed me down and my ego can handle it. I've also learned there is more scenery on a ride than just a bike computer screen.

John
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