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+--- Thread: Heavy steering problems (/Thread-Heavy-steering-problems)
RE: Heavy steering problems - exigejoe - 17-10-2011 09:20pm
but isnt overall diamater about the same in 19 with 55s as opposed to 20 with 45s. IDK
RE: Heavy steering problems - PhilSkill - 17-10-2011 09:26pm
(17-10-2011 09:20pm)exigejoe Wrote: but isnt overall diamater about the same in 19 with 55s as opposed to 20 with 45s. IDK
19" with 235/55 Dia 741mm
20" with 245/45 Dia 729mm
No guarantee this is correct by the way!
RE: Heavy steering problems - exigejoe - 17-10-2011 09:42pm
They shoud use 255 to close up the gap or use a 50 profile. I might use 50 instead of 45 when i get my 20s.
RE: Heavy steering problems - mark_n - 17-10-2011 10:59pm
Surely the rolling diameter of the wheels has to be the same whichever size of wheel is used, otherwise the speedometer accuracy goes out the window...
Heavy steering problems - LP - 17-10-2011 11:05pm
I dont think speedometers are very accurate. At least not compared to my tomtom. I thought this was one reason why the police turn a blind eye to people doing 10percent more than the limit. In my mini 77 on the speedo is 72 on the Tom Tom.
RE: Heavy steering problems - PhilSkill - 17-10-2011 11:11pm
(17-10-2011 11:05pm)LP Wrote: I dont think speedometers are very accurate. At least not compared to my tomtom. I thought this was one reason why the police turn a blind eye to people doing 10percent more than the limit. In my mini 77 on the speedo is 72 on the Tom Tom.
Speedos are nominally set to read 4% fast to give a margin for error.
RE: Heavy steering problems - berlin2011 - 17-10-2011 11:18pm
Circumference of 19" 235/55 is 2,329mm and the 20" 245/45 is 2,290mm (rounded) so the difference in distance covered with each revolution of the wheel is ±39mm (more by 19") or 1.73%….. which considering that over the life of a tyre the tread reduction from new to the minimum legal depth (±20% of new) will have pretty much the same or slightly greater impact on the circumference and hence accuracy of speedometer I would not worry too much about this.
RE: Heavy steering problems - Tekno - 17-10-2011 11:31pm
PDI?
RE: Heavy steering problems - mark_n - 18-10-2011 05:28am
Pre-Delivery Inspection. The dealer is supposed to check the car and take it for a short test drive to ensure all is well.
RE: Heavy steering problems - Tekno - 18-10-2011 08:46am
I guess that's why mine had 28 miles on the clock and a CD in the player when I picked it up.