Does wheel size effect speed??

[ashbox]

i dont believe holden can recalibrate it .... not if it has more than 12 kilometres on it. i may be wrong though.

thats only the kilomteres they can't adjust.
they'll be able to correct the speedo cos its just a tweak of the software.

 

[ducker85]

thats only the kilomteres they can't adjust.
they'll be able to correct the speedo cos its just a tweak of the software.

but there no needs to if you go 15's to 19's the speed DOESN"T change at all, not 1km, nothing.

trust me I've spend many hours in my wheel shop asking questions and i've run these wheels and double checked with the GPS speedo

 

[JBDrifter]

Anyone know how much Holden charge for recalibration of the speedo?

 

[ScoHar]

as for acceleration you may find your car slightly slower, as bigger wheels usually mean more weight (of course depending on wheels its quite a broad statement) and 10kgs weight difference can end up being quite a difference. I had 18's on my VP and it goes a lot (can actually feel the difference) better with 15's on I think they were about 10kgs difference per wheel. theres some sort of calculator on the net that can tell you how much 10kgs is when its rotating or somewhat.

as for the speedo, it'll be out by bugger all but you can get speedo pulse changers or something that you can change the pulse outputted by the gearbox going to the speedo.

 

[harvs01]

I have a sv6 std rims were 17" have now got 18"s and the speedo is 2k out. eg i go 70 by speedo the actual speed is 68. as test through the check you speed things they have on the freeway's

 

[WogBoyz]

mine vs ute came stock with 16's ive now got 18s with low profiles does that mean my speedo could be slightly out?

 

[ScoHar]

I have a sv6 std rims were 17" have now got 18"s and the speedo is 2k out. eg i go 70 by speedo the actual speed is 68. as test through the check you speed things they have on the freeway's

it prob was out by 2kms with 17's too.

 

[ScoHar]

mine vs ute came stock with 16's ive now got 18s with low profiles does that mean my speedo could be slightly out?

ever so slightly prob un-noticable.

 

[Turd Ferguson]

as for acceleration you may find your car slightly slower, as bigger wheels usually mean more weight (of course depending on wheels its quite a broad statement) and 10kgs weight difference can end up being quite a difference. I had 18's on my VP and it goes a lot (can actually feel the difference) better with 15's on I think they were about 10kgs difference per wheel. theres some sort of calculator on the net that can tell you how much 10kgs is when its rotating or somewhat.

as for the speedo, it'll be out by bugger all but you can get speedo pulse changers or something that you can change the pulse outputted by the gearbox going to the speedo.

with the walkinshaw clubby its 3 seconds quicker around a track with 20's over the standard 22'' rims

 

[cntcm3]

ive got 19's on my SV6 n my speedo hasnt changed, i checked it against my sat nav