Help Needed: Change of cassette from 12/25 to 11/28

Baybash
Posts: 136
I've been given a new cassette for my road bike. I have Shimano Sora 8 speed and the old cassette was a 12/25 and I now have a Shimano HG70 11/28. Can I just swap the cassettes?

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What chain length should I have then?0
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You can work out chain length required here:
http://www.machinehead-software.co.uk/bike/chain_length/chainlengthcalc.htmlCycling weakly0 -
Fit it and try it. I doubt you will need to change the chain length. It's not a big jump.Nothing to prove. http://adenough1.blogspot.co.uk/0
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I change my casstte between the sizes you have frequently and on different bikes. Never had any problems. There should be enough slack in the chain to cope with the 12-28. As the other person say just try it and see if you can get into the 39/28 gear0
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if you have a long cage mech, it should be able to handle it.0
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morrisje wrote:I change my casstte between the sizes you have frequently and on different bikes. Never had any problems. There should be enough slack in the chain to cope with the 12-28. As the other person say just try it and see if you can get into the 39/28 gear0
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er one thing no thing no one asked but are both the cassettes the same number of cogs? ie; 8 ! if not you got a prob ! if they are your be fine ! :-)0
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An 8 speed 11-28 (11,12,14,16,18,21,24,28) is a poor choice for a road cassette as the jumps between some gears such as 12 to 14, 14 to 16, 18 to 21, 21 to 24, and 24 to 28 are too big. In fact, only 11 to 12 and 16 to 18 are what i would consider acceptable.
With 8 speed road cassettes it's best to stick to something like 12-25, 12-26, 13-26, or 12-23, 13-23 if you don't need a 25 or 26.0