Doh! Changing a Cassette Error!

[ianbarton]

The cassette on my Giant Defy 2 is rather worn. I have been using a Wahoo trainer over the winter, which had a supposedly identical new cassette on it. I took the cassette off the Wahoo and fitted it to the Giant. The old Giant cassette had a spacer behind and the Wahoo has a spacer if you have a Shimano rather than an SRAM cassette.

I couldn't work out why when I put the cassette plus spacer on the Giant there was no way I could start the locking nut, as there wasn't enough thread to engage with the wheel. After much bad language, I realized that I the "identical" cassette I was trying to fit was 34 not 32, so it didn't need a spacer!

Edit: new cassette had one more cog than the old one.

 

[Ajax Bay]

the "identical" cassette I was trying to fit was 34 not 32, so it didn't need a spacer!

Size of largest sprocket is irrelevant to the width of the cassette.

 

[roadrash]

I don't understand how the number of teeth make a difference to the width of the cassette

 

[Ajax Bay]

TMN to me, please.

 

[ianbarton]

I don't understand how the number of teeth make a difference to the width of the cassette

Sorry didn't make it clear. It had an extra cog. I got the cassette details from the Giant web site so assumed the new cassette would be the same as the one on the bike.

I guess that LBS changed the Cassette at some point in the bikes service history.

 

[Ajax Bay]

the "identical" cassette I was trying to fit was 34 not 32
didn't make it clear. It had an extra cog

Perhaps it would help others if you edited your original post.

 

[ianbarton]

Perhaps it would help others if you edited your original post.

Done!

 

[Racing roadkill]

There are no cogs, only rings and sprockets.

 

[OldShep]

I’m confused. Can anyone explain what’s going on here

 

[Yellow Saddle]

Plenty of cogs, all on sprockets. Some sprockets called rings, specifically chainrings.

 

[DaveReading]

It's always good to be educated.

 

[winjim]

It's always good to be educated.

View attachment 463568

IIRC the £2 coin has a similar problem.

 

[Ming the Merciless]

Are you saying you didn't realise one shifter was 11 speed and and the other was 10 speed or something?

 

[Ajax Bay]

Are you saying you didn't realise one shifter was 11 speed and and the other was 10 speed or something?

I decided not to even 'go there'!