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Road bike gearing

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  • 02-01-2021 4:21pm
    #1
    54and56
    Registered Users Posts: 7,669 ✭✭✭


    Is swapping a 105 52-36 chainring for a 50-32T (what does the additional "T" mean?) paired with an 11-34 rear cassette be a good idea if I'd like more help climbing or would the gain (1.06 down to 0.94) be negligible?


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    #2
    magicbastarder
    Moderators, Category Moderators, Arts Moderators, Sports Moderators Posts: 49,572 CMod ✭✭✭✭magicbastarder


    can you go to 50-32? compact pairing is more usually 50-34.


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    #3
    Wishbone Ash
    Registered Users Posts: 24,993 ✭✭✭✭Wishbone Ash


    54and56 wrote: »
    ..(what does the additional "T" mean?)
    T = tooth/teeth.

    I've never heard of a 50/32 ??


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    #4
    54and56
    Registered Users Posts: 7,669 ✭✭✭54and56


    magicbastarder wrote: »
    can you go to 50-32? compact pairing is more usually 50-34.

    My bad, it's 50-34T, not 50-32T.

    That would alter the lowest gearing from 1.06 to 1.0 which does seem fairly negligible.


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    #5
    54and56
    Registered Users Posts: 7,669 ✭✭✭54and56


    Wishbone Ash wrote: »
    T = tooth/teeth.

    That makes sense but the Shimano website only adds the "T" to the 50-34 version of the chainring not the 53-39 or 52-36, see https://bike.shimano.com/en-NZ/product/component/shimano105-r7000/FC-R7000.html which is what prompted me to ask.


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    #6
    magicbastarder
    Moderators, Category Moderators, Arts Moderators, Sports Moderators Posts: 49,572 CMod ✭✭✭✭magicbastarder


    if you're leaving the cassette alone, it's an expensive way to gain a few percentage points, ratio wise (it's less than a 6% difference). something i'd do if i had intended to change the chainset anyway.


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    #7
    54and56
    Registered Users Posts: 7,669 ✭✭✭54and56


    magicbastarder wrote: »
    if you're leaving the cassette alone, it's an expensive way to gain a few percentage points, ratio wise (it's less than a 6% difference). something i'd do if i had intended to change the chainset anyway.

    I agree, something to consider for when the 52-36 needs replacing.


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    #8
    a148pro
    Registered Users Posts: 2,205 ✭✭✭a148pro


    I went from 11 - 28 to 11 - 36 on a 50 - 34 recently and it made a big difference in the hills. But I think you'd be going from a 36 to a 34 on the small ring which is almost no difference at all? Probably what has already been expressed mathematically above.


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    #9
    jimm
    Registered Users Posts: 650 ✭✭✭jimm


    54and56 wrote: »
    That makes sense but the Shimano website only adds the "T" to the 50-34 version of the chainring not the 53-39 or 52-36, see https://bike.shimano.com/en-NZ/product/component/shimano105-r7000/FC-R7000.html which is what prompted me to ask.

    It's just to avoid repetition. The line below it only states "mm" once, after the 175 crank arm length.


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