replacing a seven speed cassette with a seven speed

[busdennis]

my rear cassette was past its best so i bought a HG30 replacement, (the old cassette was so dirty i couldnt make out anymake or number)

anyway its too small (or thin)and the locking ring is tight but the rear cassette isint.


can you shim it out with a washer?

will i have to adjust the rear derailleur?



thanks

 

[chillyuk]

Don't you need a spacer behind the cassette? My bike uses a 7 speed freewheel, and I looked into updating the wheel for one that took a cassette rather than a freewheel as my drop out spacing is correct to do this. I wanted to retain 7 speed so I could use my existing shifters and derailleurs. I was told by people on here and the LBS that I would need a spacer (3mm from memory??) behind the cassette. These spacers are easily available.

 

[fossyant]

You can also buy e speed cassettes. 7 speed don't mind 3.0mm spacers. 7 speed is normally 3.1mm. Just pop a spacer on the freehub first, then fit the cassette. Strip your old cassette if you don't have spares.

 

[TheDoctor]

There would have been a space on there already - it probably got banned along with the old cassette...
As above, a 3mm spacer's what you need. Couple of pounds...

 

[albion]

ctc gives most of the VARIABLE data

http://www.ctc.org.uk/desktopdefault.aspx?tabid=3946

Stuff can be made to work but is often a kludge.

 

[TheDoctor]

OP is trying to replace a 7 speed cassette like for like.
It's just that the spacer's gone astray, I'm sure.

 

[busdennis]

hi

it was 7 speed for 7 speed mate, correct.

carnt remember seeing or losing a spacer but i defo need one so i took the old cassette apart and those spacers are way to thick (3mm)


bought some spacers from velso (spacers more expensive than the new cassette lol) and it needed spacing at 1.2mm.



anyway im back on the road and thanks for all the help