Rear 105 cs-5800 Cassette Upgrade - 11-28T for 11-32T
Hi,
My wife currently rides a B'twin Triban 540 with Shimano 105 cs-5800 11-28T cassette. As we live in the Yorkshire Dales, she's finding the hill climbing quite challenging and I've suggested she swaps the cassette for a 11-32T.
My plan is just to replace like for like - i.e. Shimano 105 cs-5800 11-28T for Shimano 105 cs-5800 11-32T.
Is there anything I need to consider before changing the rear cassette, or is it simply a case of removing the existing cassette for the new one?
Thanks in advance,
G
My wife currently rides a B'twin Triban 540 with Shimano 105 cs-5800 11-28T cassette. As we live in the Yorkshire Dales, she's finding the hill climbing quite challenging and I've suggested she swaps the cassette for a 11-32T.
My plan is just to replace like for like - i.e. Shimano 105 cs-5800 11-28T for Shimano 105 cs-5800 11-32T.
Is there anything I need to consider before changing the rear cassette, or is it simply a case of removing the existing cassette for the new one?
Thanks in advance,
G
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Short cage version officially compatible with largest sprocket 28T (Although some claim to have made it work with 30 or 32, sometimes by adjusting the B screw)
Medium cage version officially compatible with largest sprocket 32T (so you might get away with slightly bigger...)
You should also consider the total capacity of the mech (have a google)
Thanks mfin, I was really craving some mid-afternoon pedantry and that hit the spot perfectly
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Thanks for the reply - she's riden the bike about 6 times, so I'm assuming the chain should be fine with the new cassette
Thank you for the advice, Keef. I checked the rear derailleur and it has 5800 stamped on it - does this provide enough to identify if it's short vs. medium?
Thanks,
G
Just take a ruler and measure the centre to centre distance of the jockey wheel spindles. According to Sheldon Brown
http://www.sheldonbrown.com/harris/derailers-rear.html
For a short cage (SS) derailleur it should be 50mm. Medium cage (GS) will be 74mm
Sorted - thank you! Looks like I have the GS Medium Cage.
Thanks again to everyone who has responded.
This one? http://www.wiggle.co.uk/shimano-105-r70 ... 8000857982
Thanks Deano. Did you need to make changes to the chain, or could it cope with the 11-32. Think I'm about to press the trigger on this one (11-34) - just not sure about the requirement to also lengthen the chain http://www.wiggle.co.uk/shimano-105-r70 ... b+Networks
Unless of course you can guarantee that the bike will never be ridden using the big chainring and the 2 largest sprockets... We all know you shouldn't cross-chain like that, but it sometimes happens when you're trying to crest a hill without shifting at the front and you lose track of where you are on the cassette. And if your chain's too short you risk damaging the mech, and the possibility that something ends up in the rear wheel
You could always fit the new cassette with the old chain and see what it looks like on the big ring and carefully changing down to successively bigger sprockets with the bike in a workstand (or upside down on the lawn
Any advice, gratefully received.
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Before anyone replies that nobody needs a gear that low. If you are as old as me and do not like walking up hills in the Lake District,you do and no, you will not fall over because you are going so slow.
If you ride a bike with a chain that is too short to work on big sprocket and big chainring because you do not use that combination , you are just waiting for a lapse in concentration and an expensive noise. At the other extreme, small/small, a droopy chain is not a problem.
Consequently, I recently bought a silver 7000GS mech for £38 https://www.chainreactioncycles.com/shi ... prod173487 and plan to buy an 11-34 cassette soon. The existing mech may well have worked, but I fancied trying Shadow clutch technology along with playing it safe for the 34T sprocket use. While the 11-34 cassette gives me a slightly easier gear, it only has 11-13-15 sprockets at the high speed descent end which suits me fine, as it will give me more gear options for getting up inclines (17-19-21-23-25-27-30-34).
Don't know what I'm going to do about the chain yet that was fitted around end of October, guess it depends upon when I fit the 11-34 kit, I shall probably try simply adding a full link including another KMC Master Link as I suspect I'll change the drivetrain around March unless winter is prolonged again and I've not done much mileage on the turbo over winter as I've been climbing virtual hills!
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Chain was slack in 32-11 but it's not a combo I use, and will go back to the 34T once the weather improves.
Interesting, I was wondering if I could get away with adding a couple of Master Links into the chain, spaced well apart, rather than replace it. I was guessing that 2 extra links would allow for the 4 extra teeth.
Has anybody else done this, and got any tips?