Bicycle Mechanics - are campy 10 speed cassettes wider than shimano 10 speed?

I'm about to convert my shimano wheelset to use with a campy derailleur. Rather than get a campy hub body and a campy cassette, can I respace an SRAM cassette and just use that with my shimano hub? Or are campy cassettes just wider...not allowing me to get that last couple of cogs on??

I've seen some pics of campy and shimano cassettes side by side. Anyone have that url handy?

sheldon brown web page... about shimagnolo.

there's a lot more to it than just cassette width. Cable pull ratio being the primary one.

there's a lot more to it than just cassette width. Cable pull ratio being the primary one.

Not if he's using the matching Campy shifter.

Then it's just a question of cassette spacing.

And yeah, avoid Campy rear hubs like the plague; that awful design needs boycotting.

You may need to either add dish, or lose a cog and perhaps get a chance to take a bit of dish out.

I've never read a legitmate posting of early Campy hub failure that has anything to do with it's design. Some fools never do any maintenance and cause themselves problems, but that's user error.

Shimano tried a design that's similar to Campy with the 7800 model, but abandoned it after 2 years. The problem with the Shimano design is it does not allow for deep aluminum splines on the cassette body (to reduce weight). The shallow splines need to be made of heavier steel or Ti to have decent longevity.

Every brand I know of, other than Shimano, uses a design that works just like Campy's. The bearings that support the weight of the bike and rider are inboard of freewheel mechanism. Obviously, the design works.

from Sheldon:

Campagnolo 10-speed
sprocket thickness 1.7 mm
spacer width 2.42 mm

Shimano 10-speed
sprocket thickness 1.6 mm
spacer width 2.35 mm
By my calculations (10X sprockets + 9X spacers) the total widths should come to:
Campy = 38.7mm
Shimano = 37.1mm
I did the math because I'm thinking about doing this also. Seems like there'd be little if any lockring thread contact.

You can buy conversion cassettes from Wheels Manufacturing or American Classic.

Those width calculations are correct, but not totally relevant. The actual spline length on a Campy hub is only about 36mm. The cogs overhang the splines at both ends. The new 11 speed cassette is 39.6mm in width, but still fits on the same Campy 9/10 speed hubs.

Most hub brands, other than genuine Shimano, can be converted to Campy with a new cassette body.