Changing a single gear...

[E65Ross]

I'm currently running 10 speed 12-30T cassette on my road bike, I need the 30T cassette as I often ride hills over 15% but, likewise, I often travel down a hill which always has me over 30mph, often 35+....

I was wondering whether I could get an 11-28 and just swap the 11T for the 12T? I find there's very little difference in ratio between 9th and 10th anyway, so having one that bit taller would be fine.

I'm guessing I wouldn't need to adjust the chain length for this? Anything that would prevent me doing this and from being a straight swap?

Cheers

[jamiebae]

You can't just swap cogs over on most cassettes (assuming it's Shimano) but you could just buy a 11-32 and stick that on instead. It depends on rear mech length and you might need another link or two in the chain though.

[IroningMan]

My 105 short cage mech copes with the 12-30 I run, but I doubt it would manage 11-32.

[Magic919]

You should be able to pedal up to 35 and then either pedal faster or stop pedalling. Unless this is for a race.

[E65Ross]

jamiebae said:

You can't just swap cogs over on most cassettes (assuming it's Shimano) but you could just buy a 11-32 and stick that on instead. It depends on rear mech length and you might need another link or two in the chain though.

I'm running an ultegra cassette which isn't just 1 block of gears, aside the 1st 3 gears. The rest are individual... Hence why I can't see why I couldn't change just the last gear?

I don't think they do 11-32 in 10 speed?

[jamiebae]

E65Ross said:

jamiebae said:

You can't just swap cogs over on most cassettes (assuming it's Shimano) but you could just buy a 11-32 and stick that on instead. It depends on rear mech length and you might need another link or two in the chain though.

I'm running an ultegra cassette which isn't just 1 block of gears, aside the 1st 3 gears. The rest are individual... Hence why I can't see why I couldn't change just the last gear?

I don't think they do 11-32 in 10 speed?

So maybe you can swap the final cog, I don't think it's a good idea though as you'll have a big jump between gear 9 and 10.

You can get a 11-32 in 10 speed for sure, either current Tiagra or old 105/Ultegra

[WinstonWolf]

jamiebae said:

E65Ross said:

jamiebae said:

You can't just swap cogs over on most cassettes (assuming it's Shimano) but you could just buy a 11-32 and stick that on instead. It depends on rear mech length and you might need another link or two in the chain though.

I'm running an ultegra cassette which isn't just 1 block of gears, aside the 1st 3 gears. The rest are individual... Hence why I can't see why I couldn't change just the last gear?

I don't think they do 11-32 in 10 speed?

So maybe you can swap the final cog, I don't think it's a good idea though as you'll have a big jump between gear 9 and 10.

You can get a 11-32 in 10 speed for sure, either current Tiagra or old 105/Ultegra

They certainly look interchangeable but I've never done it, perhaps we need a guinea pig?

[Matt_N]

It's not possible as confirmed unless you remove the 14t as confirmed in this thread http://www.bikeforums.net/bicycle-mechanics/277474... due to the different size of the cog, its width and how they sit together when assembled and different lock rings.

[E65Ross]

Matt_N said:

It's not possible as confirmed unless you remove the 14t as confirmed in this thread http://www.bikeforums.net/bicycle-mechanics/277474... due to the different size of the cog, its width and how they sit together when assembled and different lock rings.

Ah, thanks for letting me know!

[Mr Ted]

My Genesis Croix de Fer has Tiagra 11-34 rear which I find very useful, no problem with chain tension and it runs 50/34 front