|
|
| Re: Wheels Size |
Subject: Re: Wheels Size
by Dodgeman on 2003/10/30 10:18:29
Razor
Your front tyres are listed at 578mm & this is probably about 2mm LESS than original, so they look to be pretty much ideal.
The rears are listed at 596mm which makes them about 15 or 16mm larger than original.
Soeedometer needles are propelled by a spinning magnet inside a tin drum & they are held back by a fine coiled spring. They have always been an inexact science & they usually read a little on the fast side, so in many cases the larger tyres will allow the car to catch up to the speedo.
Probably the best method is to find a stretch of road with an exact known distance. In NSW we have 5k long sections on some highways that are 1k marked & you could pull to the side of the road at the zero post [start] & set your trip meter to zero [if you have one] or take a carefull note of the exact position of your odometer. Drive in the left lane to the 5k marker & stop [not in the traffic lane dummy] Carefully study the reading & try to work out the under ot over reading as a percentage [it's not hard]
The ideal is to have it read accurately, but you could live with an error of as much as 5%. Just add or subtract the error from your speed reading to get a ball park correction.
Sometimes old Gregories manuals had some Wheels Magazine road tests in the back & these often had a chart showing the indicated speed & the true speed. My Datsun 1000 & 1200 manual has them, but the 120Y one does not. As for the Sunny? Don't know.
Chris
|
|
