Question about cassettes

SpaceFlightOrange

Old School Hero
I'm getting confused...

I have an XT M737 (96 i think, from looking at the spider (4 sprockets on the spider, i think later one's had 5)

I'm aware that in 98 the cassette was labelled CS-M737-I (IG)

looking at modern alternatives, the replacement seems to be the CS-HG70. However Wiggle is advertising this as an HG70-I and others just as HG70. Wiggle's description specifically mentions IG, as does SJS (who refer to it as HG70) but the likes of Evans, etc mention HG.

does anyone know if there are two types of HG70 or just one?

Thanks
 
IG is where the sprocket teeth are profiled on both sides IIRC, on HG it's just the outer. Frankly the difference is minimal and they are interchangeable.
Frankly I use SRAM now as they appear to last longer and are lighter than the Shimano ones on offer new these days.
 
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