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tire size question |
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stormhyacinth 
MINI Motorer 
Joined: April/24/09 Location: woodinville Status: Offline Points: 242 |
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 Topic: tire size questionPosted: May/01/09 at 10:34am |
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my MCS front is 205/45R17 . I have 2 brand new tires in my garage with 225/45R17 will it be ok to use on my MCS? differrent is 205 n 225
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ED
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YakiMini
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Joined: November/08/05 Location: United States Status: Offline Points: 3531 |
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Posted: May/03/09 at 1:47pm |
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the 225 is going to be larger rotation wise.... how much I don't know
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MINI-less... If God allows, I will have one again some day. :D
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scoop
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Joined: July/28/07 Location: West Seattle Status: Offline Points: 1489 |
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Posted: May/03/09 at 10:58pm |
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Unless you're running 9"-wide rims with 20mm spacers (
 ), those will fit just fine and help fill in the unsightly gap. When you start talking 235, then you may or may not have issues.
Speedo-wise, you're looking at -2.9%. So, when the speedometer says 60 mph you are actually doing 61.8 mph.
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Habanero
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Joined: May/08/07 Location: Bellevue Status: Offline Points: 111 |
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Posted: June/01/09 at 10:20am |
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Scoop, that's really interesting!
Habanero, like many MINI's, goes exactly 2 MPH slower than it's actual speedometer reading. (That's of course unless ALL the speed monitors in Bellevue are off by 2 MPH.) Having had several loaners from NW MINI (that's another story), they've all shown the same speed error.
Anybody else have the same experience??
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Mike & Ruth
'07 MCS, CR/B, NO sun roof, DSC, LSD, Premium, Leather, English Oak, chrome line interior, blingy thingies |
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scoop
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Joined: July/28/07 Location: West Seattle Status: Offline Points: 1489 |
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Posted: June/01/09 at 1:11pm |
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Yep. It's a MINI thing (and an answer to a trivia question on the Winged Victory rally). Off to find out why since I never did know why ...
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kenru
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Posted: June/01/09 at 2:46pm |
Make sure you use all 4 tires of the same size. Your DSC will have fits otherwise! |
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One good turn deserves another...and another...
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johnf36
PSMINI Expert Advisor 
PSMINI Member Joined: August/30/07 Location: Ephrata, Wa. Status: Offline Points: 8612 |
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Posted: June/01/09 at 5:11pm |
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+1 for Kens answer.
and +1 Scoop for good info on fit and speed. |
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If everything seems under control, you're just not going fast enough.
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phydeaux
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Posted: June/02/09 at 12:09am |
It's because BMW doesn't want there to EVER be a question of whether you were going over the speed limit because of a low reading on the speedo. At least, that's the story that I have heard. It's not my story, but I'll stick to it until told otherwise. Then, like many politicians, I'll flip-flop with the best of them. ;) |
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SMOG
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PSMINI Member Joined: April/07/09 Location: Port Orchard Status: Offline Points: 4296 |
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Posted: July/30/09 at 12:06am |
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So, if I understand this thread correctly and my Mini came with 195x55x16's would 205x55x16's put the speedo back to real speed?
I presently am running some General Altimax HP 205x50x16's and there is a noticeable higher reading on the speedo than actual speed. Nice tires otherwise and they do put some zip into around town driving since the gear ratio is lower. Stephen |
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I wish there was a local MINI Dealership, like our Honda, Subaru, Mazada and VW.
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Wildfamily
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Posted: July/30/09 at 2:01am |
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I don't think that is enough change in circumferance to make the difference up. I think if you go to tirerack.com they have a matrix showing speedo impact of different tires.
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'15 F55 Cooper Volcanic Orange
'80 Mini English White |
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SMOG
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Posted: July/30/09 at 3:06am |
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Wildfamily:
The Miata site has the best tire/speed comparison that I have found and the 205x55x16's are 1.73 % difference. I guess the GPS method is the best way to figure it out. Stephen |
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I wish there was a local MINI Dealership, like our Honda, Subaru, Mazada and VW.
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johnf36
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Posted: July/30/09 at 5:25am |
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If everything seems under control, you're just not going fast enough.
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SMOG
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Posted: July/30/09 at 6:59am |
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John:
Thanks for the interesting info, but it takes you right back to the Miata calculator once you start exploring the sights for speedo calcs. Back to the GPS since the Mini apparently does not have a published error that they program into the computer. I have used my GPS for other things but it appears that this unit will be something that should be mounted at all times since the factory speedo is not accurate. Stephen |
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I wish there was a local MINI Dealership, like our Honda, Subaru, Mazada and VW.
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johnf36
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Posted: July/30/09 at 10:08am |
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Okay so are you wanting to know how much it is off, that is 2 mph. Based on a 24 inch wheel
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If everything seems under control, you're just not going fast enough.
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SMOG
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Posted: July/30/09 at 10:10am |
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John:
Thanks, that helps! Stephen |
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I wish there was a local MINI Dealership, like our Honda, Subaru, Mazada and VW.
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johnf36
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Posted: July/30/09 at 10:19am |
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When I installed my 215-45-17s it came real close to correcting the 2 mph speedo error. the correction was 1.5. Bruce had a real cool tire computer I will see if I can find it.
Edited by johnf36 - July/30/09 at 4:44pm |
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If everything seems under control, you're just not going fast enough.
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SMOG
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Posted: July/30/09 at 10:09pm |
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John:
Another related question; Mini's come with many different wheel and tire packages and Horsepower options but do they all have the same speedometer? Are they calibrated from the factory for the wheel and tire package as it rolls off the assembly line? Stephen |
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I wish there was a local MINI Dealership, like our Honda, Subaru, Mazada and VW.
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SMOG
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Posted: July/30/09 at 10:11pm |
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John:
I should have said, are they calibrated DIFFERENTLY for the different wheel and tire packages? Stephen |
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I wish there was a local MINI Dealership, like our Honda, Subaru, Mazada and VW.
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johnf36
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Posted: July/31/09 at 2:41am |
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It is my understanding that the calibration in done in the computer not the gauge.
John |
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If everything seems under control, you're just not going fast enough.
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SMOG
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Posted: July/31/09 at 4:11am |
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John:
That appears to be correct, which makes me think it could be programmed. I knew it was not a gauge issue. The factory might have two ECU's or two separate programs for one ECU for the Cooper S and the Cooper, but I suspect one ECU and various programs for the different options. This takes me back to the question, is the factory putting out different programs for the speedo for all the various tire and wheel combination's that are offered? Or is it one size fits all mentality? Stephen |
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I wish there was a local MINI Dealership, like our Honda, Subaru, Mazada and VW.
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johnf36
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Posted: July/31/09 at 4:26am |
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I would have to look it up but it seems to me that there are 5 computers in the car and the one I think we are talking about controls all the interior functions.
There are some things you can change through the speedo display. I have not seen yet where you can adjust the speed. You can do it with the mileages calculator.About half way down on this page you can find the stuff on the display. http://www.mini2.com/forum/faq.php?faq=faq_interior#faq_diy_obc_functions |
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If everything seems under control, you're just not going fast enough.
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johnf36
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Posted: July/31/09 at 5:02am |
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If everything seems under control, you're just not going fast enough.
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CosmicTraveler
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Posted: July/31/09 at 6:44am |
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Try this calculator on for size.
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 Take It Easy ... Buck
'06 MCS JCW CR/CR |
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johnf36
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Posted: July/31/09 at 10:06am |
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Thanks CT that's what I was looking for thanks
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If everything seems under control, you're just not going fast enough.
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SMOG
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Posted: July/31/09 at 11:33am |
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John:
The NAM link I had seen and deemed it not something worth pursuing without since without being to easily get back to square 1, the default, I could screw something up royally! The GPS has my vote so far. The tire size calcs on all the web sites helps; thanks John & CT. Stephen |
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I wish there was a local MINI Dealership, like our Honda, Subaru, Mazada and VW.
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johnf36
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Posted: July/31/09 at 12:14pm |
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I know with doing the math from the Mini2 page and useing the calculator that CT posted I picked up the 1.4% . I k ow this because before I changed my tire size I clocked my car through a measured mile and cross check with GPS and 2 other cars Speedos. They all came out the same showing my mini 2 mph slow. Now that the new tires are on I ran the car through all the same things and it matches the math
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If everything seems under control, you're just not going fast enough.
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stormhyacinth wrote: