HG ???

pipsqueak

Buying a new shimano 8 cassette.

Can someone explain the HG numbers ( 40 - 50 - 60 etc) I'd like to know for compatability for my 105 wheels.

Thanks.

maddog 2

they're all compatible - the bigger the number the better the cassette

HG70 is LX/105 level (essentially)

HG50 is Deore/Tiagra

Not much between them in practice. You need to go up to a cassette with a spider to get decent weight savings i.e. XT/Ultegra and above

see CRC for some good deals

pipsqueak

thanks

gkerr4

and the 'HG' part stands for Hyper-glide

in case you were interested!

El Gordo

So what's the difference between HG and IG? It's something I've never got to the bottom of..

redvee

Sheldon Brown wrote:

The newer Shimano 7-speed cassettes have carried the Hyperglide principle even farther, by adding ramps and contouring to both sides of the sprockets. To do this while maintaining the full thickness of the teeth, the designers had to make the sprockets thicker. Since the sprockets are thicker, the spacers must be thinner to maintain the correct spacing. Also, since the sprockets are thicker, Shimano says you shouldn't use H.G. chains on I.G. cassettes. Sachs chains are compatible with both types.

Shimano says that you shouldn't mix I.G. and non-I.G. sprockets, but if you use one I.G. spacer per I.G. sprocket, you should be all right. Some experimentation may be required for best results with a mixed setup.