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  1. #1
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    May 2006
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    Playing with ratios

    Firstly apologies for being a complete newbie!

    I came about a lovely old Merlin road bike about half a year ago and have enjoyed every second of riding it, and am planning on taking it with me on a tour across Europe this summer. My only worry is that my ratios aren't all that great for climbs, especially when carrying weight.

    Not being an expert, i can't give you the model of any of the components but my best insight is:
    -6 speed cassette 13-?
    -2 rings on front 42-52
    both derailleurs are campagnolo.

    After reading several other posts on here i'm pretty confident that the front derailleur has plenty of space for changing the inner ring to a smaller size... although i'm not sure quite how to match the chainrings to the crank, other than the knowledge that it is 5 arm...?

    If i were to replace the cassette would i need to stick to the 6 speeds or would the derailleur accomodate a larger range?

    Any help would be greatly appreciated. Sorry for my ignorance!

    Duncan

  2. #2
    Senior Member
    Join Date
    Feb 2001
    Location
    England
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    At the rear you have an obscelete pattern but you can still get compatable rings. Is it Shimano or some other hub. Is it a screw-on freewheel or a splined freehub design with a locknut (engraved with "Lock->")
    Marchisio allow you to select each ring so build up the cassette with a wide range. A 12-28 is good for a light load or unladen mountain climbing.

    Your crank will limit the smallest cog you can use because of the diamter of the bolt circle.
    Compact cranks have a circle of 110mm and can take rings down to 34 t. A 34/48 will carry you up most mountains but you will probably freewheel down the fastest descents.

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