Brakes Wheels 1st Gen Tires Corrected Speedo inaccuracys

Great!!! Now you can confirm your speeding.

Mark

 

I cross referenced it. So it looks like a tire diameter of 24.9" is the sweet spot for accurate speedo readings. Tires not trunks.

 

I was 14 the last time I fit a 24:lol:

Mark

 

Tried that and Docv is right in it correcting the speedo. It also killed acceleration and mpg, on my justa, due to extra weight, so I went back. Have you noticed a change in these two things since you put the larger tires on?

Jim

 

I just realized that you and Lotise have R50's and I have an R56. The gearing might be different enough to make them react completely opposite.

Jim

 

I'm quicker on a smaller overall tire size. Smaller as in less tall.

Mark

 

Interesting. I have that sixth gear and I lost a lot on a larger tire.

Jim

 

I am still 24. But I have to measure my thigh to get that.

 

The wider tire will affect your MPG, too, beyond just the gearing differences - more rolling resistance.

 

Yepper, I found that out. :frown5:

Jim

 

I went back to 15s from 16s last week (for my first ever drive on winter tyres, which just aren't used in Britain). The first thing I noticed was just how much livelier the car is, particularly on acceleration from a standstill.

I have trouble believing that I could feel the difference in a 2% change of gearing - but then I don't think the 30% reduction in wheel weight is all that significant either. so I can't explain what I feel.

 

I can't tell what type MINI you have, but mine is a R56 and the weight made a real difference. I plan to go to lighter wheels too, as I think that will also be a help. Second generation justa's are not like the MCS, but can be made more responsive in in different ways. I am back to the stock size, but the Yokohama tires I got handle very nicely in the turns.

Jim

 

Any chance someone knows of a technical solution to the inaccurate speedometer issue?

For example, might this work?

Official home page of the Yellow Box Speedo Recalibrator

Guess I'll drop em an email and see what they say!

 

Get a Scan Gauge. The MPH readout is adjustable.

Jim

 

I had a shop calibrate my speedo a few years ago. I'm not sure what's involved mechanically, but it got me out of a speeding ticket.