235 vs 9.5.....................
Submitted: Thursday, Feb 03, 2005 at 21:18
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westBob
hi all time has come to get some new rubber on my terrano 2 is there much difference in tyre circumference between 235's or 9.5's and how much would it affect the speedo. has any other t2 owner fitted 8" rims on there t2 .. cheers Bob
Reply By: Utemad - Thursday, Feb 03, 2005 at 21:52
Thursday, Feb 03, 2005 at 21:52
What are are the other measurements of the 235? Are they 235/75 15?
The 235/75 15 has theoretical dimensions of
Diameter- 733.5mm
Circumference- 2304.4mm
The 9.5x30x15 theoretical dimensions of
Diameter- 787.4
Circumference-2473.7
What is your current tyre size?
You don't need an 8in rim for these tyres. 7in is the go.
Hope this helps.
AnswerID:
96527
Reply By: Shaker - Thursday, Feb 03, 2005 at 22:22
Thursday, Feb 03, 2005 at 22:22
Utemad is a little out in his estimations:
235/75x15 = 733.29mm diameter whereas 30/9.5X15 = 761.74 diameter.
I have just done this exercise on my Terrano 2, I threw off the 235/75 x 15 Cooper STs & fitted 30/9.5 x 15 Firestone Firehawk RMTs. So far I am very happy, Coopers were about $230 each & wore at an alarming rate, Firestones were only $170 each & have a very good tread pattern, obviously yet to find out how they wear!
Interestingly, I checked the speedo against the GPS with the bigger OD tyres & guess what? It is now exact ..... what a fluke!
Best tyre calculator is here at
http://www.1010tires.com/TireSizeCalculator.asp?action=submit
Sorry, but you will have to cut & paste the link.
AnswerID:
96536
Follow Up By: Utemad - Thursday, Feb 03, 2005 at 22:54
Thursday, Feb 03, 2005 at 22:54
You got me. I accidentally gave measurements for 31in instead of 30in :'-(
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Follow Up By: micktarrano2 - Friday, Feb 11, 2005 at 21:57
Friday, Feb 11, 2005 at 21:57
funny about the speedo my terrano2,i fitted new falker landair/at 235/75s and is 5kms under the speed reading compaired to my gps i though it was my speedo, is this a speedo problem with these little babies
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Follow Up By: Shaker - Friday, Feb 11, 2005 at 23:01
Friday, Feb 11, 2005 at 23:01
Not many vehicles have very accurate speedos ...... ask Steve Bracks, as soon as he realised it, he commissioned thousands of speed cameras & gives drivers virtually no margin for error. ADRs (joke) state that the speed measuring device must be accurate to within 10% of the actual speed being travelled. I got done for 104 in a 100 zone. $128.00!
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