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  • How to Increase maximum speed

     Steve Kish updated 11 years, 5 months ago 5 Members · 9 Posts
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  • betski

    Member
    17 August 2009 at 10:25 am

    Seems like 44/32/22 chainrings are standard on modern mountain bikes which equates to about a top speed of 25-30mph. I want to be able go go faster on the road sections of my routes. Is it just a case of changing the outer ring to 46 teeth on my Shimano Deore or is there another way to increase maximum speed?

  • hobbo31

    Member
    17 August 2009 at 2:03 pm

    You could put a bit bigger chainring on just don’t go to big

  • Steve Kish

    Member
    17 August 2009 at 7:06 pm

    11 sprocket cassette would give a 108-inch gear top. Chris Boardman hold the current 25-mile time trial record on a 108-inch gear at 45 mins 57 secs, average of over 32.6mph.

    If you want to average between 25-30mph on the road on an MTB, please can I have your autograph? 8)

  • Gunner

    Member
    17 August 2009 at 7:08 pm

    You could also look at the rear cassette and see if you could replace the smallest cogs you are using with anything smaller, that would have a similiar effect, or look at a combination of the 2, slightly increasing the front chainring size whilst slightly reducing the rear cassettes smallest sprocket.

    Perhaps a browse through Sheldon Brownes site may give you a better insight into your gearing options.

    😉

  • betski

    Member
    17 August 2009 at 7:15 pm

    ta for the replies. i’ve also pinged an email to the tech support of shimano. will post back with the reply 😀

  • tomlevell

    Member
    17 August 2009 at 7:36 pm

    Get a 29er and run 44:11 as the bigger wheels will make all the gears bigger.

    Or get bigger draggier tyres to slow you down ;0)

  • betski

    Member
    19 August 2009 at 11:57 am

    Shimano tech support responded within a day-

    They suggest changing to a 48/36/26 chainring combination to increase top speed based on my setup of Shimano LX front derailuer and Shimano Deore rear.

    Thought i could just change the outer ring but its probably not recommended.

  • tomlevell

    Member
    19 August 2009 at 11:59 am

    You can and it will probably work but you may have front and rear mech issues and you’ll need a new chain.

  • Steve Kish

    Member
    19 August 2009 at 8:07 pm

    Good ol’ Shimano tech – never recommend one ring when you have the chance to sell three! 8)

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