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Cassette’s

Viewing 8 replies - 1 through 8 (of 8 total)
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  • August 31, 2011 at 1:48 pm #652785
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    giff77

    Wouldn’t go the 11:34 if he’s
    Wouldn’t go the 11:34 if he’s in the granny ring he’ll probably have to make 2/3 revolutions to turn the rear wheel once 👿 I would go up to 28/29 and have 12 smallest. That way he has several spare teeth for the climb. And something small for powering down the decent 😀 Worst case scenario you could always push him up those climbs – they look real buggers. I use a 12:26 with a double standard and tackle Crow Road and Take me Doone in the Campsies and have learnt to value the granny ring 😀

    If not already, give him a few hints on how to tackle the climb as well. Maybe that’s why he’s running out of sprockets and jumping off. Hope it works out gkam

    August 31, 2011 at 5:10 am #652783
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    Gkam84

    I know he’ll get used to in
    I know he’ll get used to in the long run 👿 I just dont want him to lose the rag with it, so making it easier would help

    I regularly cycle The Lecht, Spittal of Glenshee or The Cairn 0 Mount and if you dont, look them up somewhere, they ramp up something stupid, there are points on the Cairn where i struggle at 30% for nigh on half a mile, i tend to jump off and push, but there are also steady 20-25% for a mile or two on other parts of my rides, where at the moment he just jumps off and pushes up, but if he could just spin a high gear, he would get there in the end alla Cav style 👿

    August 31, 2011 at 1:10 am #652781
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    mrkeith119

    In my experience in switching
    In my experience in switching between the two is that it takes a while to get used to the difference in climbing. I had a compact chainset and a 27-12 cassette to start with, and within a few months ended up changing to a double chainset and 23-11 cassette. Generaly mountain bikers ride with a much higher cadence than road riders so they can ride efficiently over rough ground. Although none of the hills I ride up are more than about 2 miles long and although they are graded up to 14% steepness is only in shost bursts. So depending on what you ride my advice may be irrelevant

    August 30, 2011 at 10:04 pm #652779
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    Gkam84

    Right so the difference in my
    Right so the difference in my chainset is 16 and my cassette is 13, so in theory a 29 should work?

    I dont mind having to get a new rear mech and chain cause they aint hugely expensive, i know i can only got for a 8 speed cassette as thats what i have now and thats what the shifters are for

    So with the 34-50 on the front with a long mech and new chain, could i get away with something like a 11-34?

    I just want to give him as much range as possible without changing the full groupset and without costing me a fortune because its my bike, once i’ve got him into climbing and used to it, then i’ll get him to work down and back to normal ratio’s like i’m using 39-52 and 13-26, then he might get his own bike as he’s only used to cross country stuff on his MTB and its all fairly flat

    August 30, 2011 at 9:27 pm #652777
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    giff77

    Work out your teeth capacity
    Work out your teeth capacity by adding the difference of the chain rings to the difference of the lrg sprocket and small sprocket. That figure gives you the max teeth your rear mech can deal with. As fringe says you need to take into account the size of the rear mech. You will also need to stick with the same amount of sprockets currently on your machine for the shifters to cope. You can get a 13:29 which works well with a compact chainset (found this flicking through a repair manual) looking at the spec of your bike you may get away with that. I like fringe have limited knowledge of the arcne art of the chainset 😀

    August 30, 2011 at 7:24 pm #652775
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    Fringe

    from my limited knowledge you
    from my limited knowledge you can generally get away with a maximum 28T sprocket with a medium cage shimano rear mech, anything larger and you need a long cage mech, fit a mtb mech, make sure the chain is long enough and you can get an 12-32 on there no problem..

    August 30, 2011 at 5:00 pm #652773
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    Gkam84

    http://techdocs.shimano.com/m
    http://techdocs.shimano.com/media/techdocs/content/cycle/SI/2300/SI_5XA0A_001/SI-5XA0A-001-ENG_v1_m56577569830673817.pdf

    So i think thats it, But its confusing, it says

    Total Capacity 35 teeth or less
    Largest Sprocket 26t
    Smallest Sprocket 12t
    Front Chain wheel Difference 22t

    So does that mean i could only go 12-26 with that one?

    August 30, 2011 at 4:37 pm #652771
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    TheHatter

    Check the shimano website for
    Check the shimano website for the tech sheet on the rear mech. This should state the max number of teeth it can handle.

    Good luck converting him from the dark side.

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