Tyre Size

[Renee]

Hey guys.

Just picked up a r32 4dr Skyline. I noticed the spedo is out about 9kmh.

Tyre size

Rear 205/55R16 86V

Front 205/55R16 91V

Would these tyre sizes affect the spedo reading?

Thanks.

[phenline]

it shouldnt effect it i mean arnt the stock rims 16s to?

[RBwhatever]

Yes they're 16's. And no it shouldn't affect speedo readings because they're the stock tyre sizes.

Only explanation can be your speedo is out. Get it re-calibrated maybe?

[Renee]

Yes they're 16's. And no it shouldn't affect speedo readings because they're the stock tyre sizes.

Only explanation can be your speedo is out. Get it re-calibrated maybe?

Ok. Thanks for the advice! How much do you think it might cost to get re-calibrated? Thanks heaps

[RBwhatever]

Don't know. I've never had it done. I don't even know who can do it, or if it can or can't be done on certain cars.

Sorry mate.

[RBwhatever]

Don't the 32's have a cable driven speedo? Maybe its got something to do with the cable.

32 owners might be able to answer this one.

[funkymonkey]

its factory equipped to read true on 205/55R16 88V tyres, so you shouldn't see any difference in speed due to the tyres. R32's do run a speedo cable to the cluster, and this can sometimes get sticky (ie the steel cable strands can seperate if bent and catch on the sleeve, causing it to spike and in general read wrong).

GPS speedo checking or dyno speed checking is probably the way to make sure if there's a variance in speed. Try with another cluster first as that's easiest to swap, then try with another speedo cable if you can't make it go away with a different cluster.

[Renee]

its factory equipped to read true on 205/55R16 88V tyres, so you shouldn't see any difference in speed due to the tyres. R32's do run a speedo cable to the cluster, and this can sometimes get sticky (ie the steel cable strands can seperate if bent and catch on the sleeve, causing it to spike and in general read wrong).

GPS speedo checking or dyno speed checking is probably the way to make sure if there's a variance in speed. Try with another cluster first as that's easiest to swap, then try with another speedo cable if you can't make it go away with a different cluster.

OK. Thanks heaps on the detailed advice The spedo pointer does bounce a little bit at 100 and i think that has got something to do with the cable to so ill check it out. Thanks

[QWK32]

its also common for the little plastic square drive on the cluster end of the speedo cable to wear out and give false reading. happened to me, speedo was out by about 15 k's then it bounced around for a couple of days the just died.

[blind_elk]

It might also be that someone has removed the needle to fiddle the ks.

Which way is it "out"? Remove the speedo unit, manually turn the needle around to the indicated speed (for a "real" 60 kph), and gently move the needle to the correct speed.

[phenline]

dont think you have to touch the needle on the speedo to screw with the km's it isnt like winding back a clock.

[funkymonkey]

yeah the only time you'd have to touch the needle was if you were gonna put some sort of EL sheet or something on the gauge itself.