Changing rear cassette

[jowwy]

ok - so you guys are helping me out with some good advice, but i need some more...

my new bike is a compact 50/34 front 12/15 rear 8speed cassette.....shimano 2300 sti

can i change the rear cassette to a SRAM 11-30 8 speed cassette.........

Thanks guys

 

[Zoiders]

12-15?

Only 4 sprockets?

 

[Herzog]

Yes, as far as I'm aware there will be no compatibility issues.

 

[jowwy]

12-15?

Only 4 sprockets?

sorry zoiders typo.......12 / 25

 

[Zoiders]

It's the length of the cage that may present problems.

http://cycle.shimano...00.-type-..html

Quoted max sprocket size is 26t.

Go over to a long cage 8 speed mech, MTB ones are dirt cheap, you could even get away with a ultra cheap tourney or suntour baragin basement special.

 

[Banjo]

Do you really need a 30 tooth cog? A 28 would probably be ok but 30 might be pushing it.

 

[JonnyBlade]

I put a 32 on a 9 speed and it's almost a pleasure travelling uphill

Actually it's a spinners paradise !!!!!!

 

[jowwy]

i'm really not sure what rear gearing i need yet as i havent done my usual hill climb on this bike........

its considerably lighter than my MTB and i'm also half a stone lighter as well cmpared to 3 weeks ago when i last did that climb, so i'm hoping the 12/25 will be ok

 

[al-fresco]

i'm really not sure what rear gearing i need yet as i havent done my usual hill climb on this bike........

I find "known" hills much easier to manage than "new" ones, which means, I guess, that a lot of hill climbing is in my head rather than in my legs.

On my road bike my lowest gear is 36 front/25 rear and I keep saying I'm going to do something about it - but this week I rode my old MTB again and thought "what the hell do I need this many gears for?" - so I think maybe I'll just get used to it...

 

[pubrunner]

I find "known" hills much easier to manage than "new" ones, which means, I guess, that a lot of hill climbing is in my head rather than in my legs.

On my road bike my lowest gear is 36 front/25 rear and I keep saying I'm going to do something about it - but this week I rode my old MTB again and thought "what the hell do I need this many gears for?" - so I think maybe I'll just get used to it...

You can cycle up the Bath Banks to Selattyn, on 36/25 ?

For the ride that I did on Sunday, I'd never have coped with 36/25. The highest gearing on any of my road bikes, is 34/25.

For around Oswestry, to venture into the hills, I'd be looking at 34/28 - as a minimum.

 

[pubrunner]

I find "known" hills much easier to manage than "new" ones, which means, I guess, that a lot of hill climbing is in my head rather than in my legs.

I'm surprised at this comment, 'cos I prefer it t'other way round.

Whilst cycling in Yorkshire at the weekend, I was actually glad that I wasn't aware of what hills I'd be climbing.

To give an analogy, running my 1st marathon was easier mentally, than subsequent ones; 'cos I was running in ignorance of the pain that I'd be in. In the following marathons, I knew that I'd expect to suffer from 20 miles onwards.