changing sprockets makes speedometer invalid?

E Montague server afm199 at earthlink.net
Wed Oct 6 15:21:24 PDT 2010


It never is. They always read high. And I have a 120 70 front. Of they are all different diameters anyway.


On Oct 6, 2010, at 3:14 PM, Chris Burgess wrote:

> The statement applies to bikes who doesn't have a pick up on the front wheel.
> 
> So for the SV650 if you change from the 120/60 front wheel to a 120/70
> and depending on the brand..your speedo isn't what the factory
> intented.
> -Chris
> 
> On Wed, Oct 6, 2010 at 3:13 PM, Jo Rhett <jorhett at fastlizardracing.com> wrote:
>> I have repeatedly seen comments on here about different sprockets and how the odometer is inaccurate.  I'm confused.  The sensor is on the front wheel -- how would running different sprockets change the validity of the odometer?  Or am I confusing this with changing front wheels?
>> 
>> Reason I'm asking is that I need to replace the sprockets & chain on my street bike.  I have a whole 520 kit with a 45 rear sprocket sitting here.  Is going from a 44 stock to a 45 rear going to affect my speedometer accuracy?  I'd rather not, as I currently live in Sunnyvale where cops are *BORED* and are known for giving tickets for 5mph over.
>> 
>> Yes I know the speedometer is "optimistic" at best.  I've done a lot of testing and it appears to be consistently 10% high -- so 44mph reported is 40mph, 66mph reported is 60mph, etc.  I'm very used to that.
>> 
>> --
>> Jo Rhett /  velociRaptor Racing
>> #553 WERA
>> 
>> 
> 
> 
> 
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