Shimano cassette help, please.

Evil Laugh
Evil Laugh Posts: 1,412
edited January 2010 in Road buying advice
Please excuse my ignorance in advance.

I have Shimano 105 kit on my bike. Crank is FSA Gossamer BB30, 34/50. Cassette is Shimano 105, 12-27.

I have ordered some new wheels (Shimano RS80) and I fancied a new cassette so I could easily swap between the 2 sets of wheels.

Also, I run out of pedal around 30mph currently and thought a different cassette could help this problem.

Can I just put any shimano 10 spd cassette on my new wheels, issue free?

Would an 11-25, for example, make much difference or is my crank the problem?

Cheers....

Comments

  • OneLessCar
    OneLessCar Posts: 50
    If I understand you correctly, you currently have a compact
    chainset and you want to go faster?

    You would see greater gain (cycle faster) with a standard chainset, (typically 53/39)
    but pedalling will be more difficult. This will give you greater speed
    over a one tooth less cog in the rear.
  • Evil Laugh
    Evil Laugh Posts: 1,412
    Aye you understand perfectly, cheers.


    So I won't notice a one tooth change in the rear, which I presume is all I can gain?


    This cycling lark's expensive.
  • redddraggon
    redddraggon Posts: 10,862
    OneLessCar wrote:
    If I understand you correctly, you currently have a compact
    chainset and you want to go faster?

    You would see greater gain (cycle faster) with a standard chainset, (typically 53/39)
    but pedalling will be more difficult. This will give you greater speed
    over a one tooth less cog in the rear.

    Errrrr.........

    50-11 is bigger than 53-12
    I like bikes...

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  • a_n_t
    a_n_t Posts: 2,011
    a popular misconception from the "compacts are for girls" brigade!
    Manchester wheelers

    PB's
    10m 20:21 2014
    25m 53:18 20:13
    50m 1:57:12 2013
    100m Yeah right.
  • OneLessCar
    OneLessCar Posts: 50
    Dude!!

    You're totally right! I'm talking out my hat and
    don't know what I'm talking about :oops:

    I totally fell into the misconception about compacts!

    So I googled a gear calculator to work it
    out...

    Evillaugh... Sorry for misleading you and
    glad for reddragon and ant for pointing
    out my error!!
  • Samson1
    Samson1 Posts: 44
    50-11 is a bigger gear than 53-12 so if you REALLY need a bigger gear a 11-25 would be a good option. Much cheaper and more practical than changing a crankset and also means it's easier to change your between different gearing for racing/sportives etc. Bear in mind that by fitting an 11-25 you will be losing an arguably more useful 16t cog so you may be better off fitting a 12-25 or even 12-23 for the closer gear ratios and work on your spinning. 120 rpm in 50-12 is nearly 40 mph and at those speeds you should really be in an aero-tuck downhill.
  • blackhands
    blackhands Posts: 950
    You don't need to change the chainset to get a 53 - just the outer ring:

    http://www.spacycles.co.uk/products.php ... 0s113p1727
  • Samson1
    Samson1 Posts: 44
    True but you can't run a 53-34 so you'd need to change the inner ring too..
  • relanium
    relanium Posts: 487
    What is the most common gear ratio for a cassette that everyone uses, is it a 12-23 or 12-25..
  • desweller
    desweller Posts: 5,175
    Samson1 wrote:
    True but you can't run a 53-34 so you'd need to change the inner ring too..

    Why can't he run the linked 53T with his 34T inner? Surely as long as they screw together he's good to go?
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  • redddraggon
    redddraggon Posts: 10,862
    DesWeller wrote:
    Samson1 wrote:
    True but you can't run a 53-34 so you'd need to change the inner ring too..

    Why can't he run the linked 53T with his 34T inner? Surely as long as they screw together he's good to go?

    Wouldn't work that well......doable, but not recommended.
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  • Samson1
    Samson1 Posts: 44
    In theory you want a 16t maximum difference between the big annd small rings so you can shift smoothly.
  • Evil Laugh
    Evil Laugh Posts: 1,412
    Samson1 wrote:
    50-11 is a bigger gear than 53-12 so if you REALLY need a bigger gear a 11-25 would be a good option. Much cheaper and more practical than changing a crankset and also means it's easier to change your between different gearing for racing/sportives etc. Bear in mind that by fitting an 11-25 you will be losing an arguably more useful 16t cog so you may be better off fitting a 12-25 or even 12-23 for the closer gear ratios and work on your spinning. 120 rpm in 50-12 is nearly 40 mph and at those speeds you should really be in an aero-tuck downhill.

    Thanks for the input. I'll try spinning faster again and see how I go before potentially wasting £45 then.

    I does feel like there's nothing more I can do at 35 but if your maths is right the problem lies with me. Will try harder.

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