[ST] RE: Front tire size

["Keith Tynan" <keith@xxxxxxxxxxxxxxx>]

> Date: Wed, 27 Feb 2002 05:42:53 +0000
> From: "pete licht" <aloishus@xxxxxxxxxxx>
> ...
> The spec front tire is a 120 (wide) 70 (high).  I was thinking of
> changing
> to a 120/60/17. This would lower the front end by 10mm, resulting in more
> radical rake/trail numbers -- which should make for quicker
> steering.  Has
> anyone done this?  Or has anyone increased the rear shock ride
> hight? Or has
> anyone raised the forks in the triples by 10 mm?  If so how does
> it affect
> handling?
>
> Right now I have the forks raised about 3mm above the tripleclamps,  so I
> could drop them down to stock or 1mm below and only change the numbers by
> about 6mm.

Pete,

If you take Avon as an example ('cos they post this kind of data)...
                                AV39    AV35
The rolling radius:    120/60 = 0.277m  0.281m
                       120/70 = 0.289m  0.291m
Theoretical ride height diff. = 12.6mm   9.8mm

FWIW, I run a 120/70 front with 5mm pull-through (this reduces the rake from
25 deg to about 24.6 deg), and this noticeably (subjectively?) sharpens the
steering. I have an Ohlins rear shock, which doesn't have height adjustment.

HTH

Regards,
- --
BRG
email: keith@xxxxxxxxxxxxxxx
'00 Sprint ST BRG 'Wolfram'


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