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Thread: Good gearing for 85-86 250R with 20" tires?

  1. #1
    InPiEcEs's Avatar
    InPiEcEs is offline At The Back Of The Pack Arm chair racerAt the back of the pack
    Join Date
    Apr 2004
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    Northeast Wisconsin
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    378

    Good gearing for 85-86 250R with 20" tires?

    I'm debating on gearing options on my 86 R, with my 20" Razr's.
    Right now, I have 14/36 gearing used with my 18" Trekkers for ice-racing.
    I'm running a 38mm PWK with an open K&N, CR cage with Aktive reeds,, an ESR pipe, and stock .020" over engine with mild cleanup porting. I'm thinking of dropping to a 13 tooth front, which will give me 13/36 gearing. I'm thinking this will be an okay all around setup.
    What do you all think, and what are you using for what type of riding?
    One piece at a time. Status: The Beast is Done..06-23-07
    Back in the saddle again
    Currently owned rides:
    My sleds, and.........
    1995 CBR600F3
    1976 Kaw 400 triple-smoker......SOLD
    1986 250R...owned since 1990
    06-23-07........the R is finally done!!!
    ESR pipe, Aktive reeds/CR cage, 38mm PWK, +4 Dominator
    mild clean-up porting, an open K&N, CR and YZ calipers.......among other things

  2. #2
    250rAL is offline Just Too Addicted Arm chair racerJust too addicted
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    Sep 2002
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    Sabula,IA
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    620
    Unless you need the extra speed, the stock gearing is hard to beat. I've always wanted to try 13/37 but I didn't want to loose the lower gearing for the woods.
    __________________
    '85 ATC250R
    .030 Over Wiseco
    FMF Pipe/Answer silencer
    36PJ Keihin
    K&N
    Boyesen reeds
    Magura hydraulic clutch
    Roost Boost
    MSR bars
    OMF swingarm skid
    ITP Beadlocks

    Three Wheelin' Since '84

  3. #3
    nate b is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Jan 2003
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    Central WI
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    I'd go 14/38
    85 atc 250r;
    PSI porting & head mods
    fmf pipe & silencer
    boysen rad valve & reeds
    38mm air stryker

  4. #4
    Join Date
    Jun 2003
    Location
    englishtown NJ
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    2,676
    I always used 14/39 for the woods and 20" tires. I now use 14/36, but thats with 18" tires and mx.

  5. #5
    Join Date
    Nov 2006
    Location
    Florida
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    1,663
    I'm running 14/39 and my tires are like 19's... I'm running some 20's but on a 10" wide wheel they stretch out

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