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Re: 155 Nankang or 145 Bridgestone

Posted: Wed Jan 02, 2019 2:46 pm
by dudload
so just about to take the plunge and get 5 145 bridgestones. only issue is that I see Bull Motif (and blackcirles) say that their B381 Ecopia is the all seasons version, whereas where I was about to order it from (Kwik Fit - 2 streets away) indicates that it's a summer tyre.

I searched Bridgestone website and it indicates the B381 as a "general use summer tyre". I'm thinking there's only one version now - am I correct?

Re: 155 Nankang or 145 Bridgestone

Posted: Thu Jan 03, 2019 6:24 pm
by ManyMinors
It sounds as if all those descriptions are for the same tyre. I have them on my Minor and drive it all year round without issue. Bridgestone also manufacture a specific winter tyre in that size and I have run those on a spare pair of wheels in poor winter conditions - I thought them excellent - and good value - but they are more like an old fashioned mud and snow tyre in appearance with quite an agricultural tread pattern. Horses for courses. I don't think you'll be disappointed with the B381 tyres - I expect some sellers refer to them as "summer" tyres simply to distinguish them from the "winter" tyres.

Re: 155 Nankang or 145 Bridgestone

Posted: Thu Jan 03, 2019 10:55 pm
by dudload
Thanks manyminors,

Was worried as bull motif make a big deal about them being the all weather version. Will probably just take the plunge and see!

Re: 155 Nankang or 145 Bridgestone

Posted: Fri Jan 04, 2019 8:20 am
by simmitc
If it's any help, I fitted the "winter" Bridgestones over a year ago and they performed perfectly during the following cold winter but also during the hot summer of last year. Their finest hour was probably clearing water during a prolonged torrential downpour over 80 miles on the M25/M40, and that was in September, not the middle of winter.

One thing to note: The all weather ones can be fitted either way rounds whereas the winter ones have a specific direction of rotation (arrow marks moulded into sidewalls) and so cannot be swapped from one side to the other; but very few people swap wheels around these days, so I do not regard it as a problem.

Re: 155 Nankang or 145 Bridgestone

Posted: Wed Feb 13, 2019 5:38 pm
by ampwhu
in regards to the question above on whether the revs would be higher on a car with 145 or 155 tyres, this is irrelevant.

those dimensions are the width, not the height of the tyre.

revs would change if you went from 145/80/14 down to 145/65/14. the tyre would be slimmer so the wheel would need to rotate faster. same applies if you fitted 13" wheels instead of 14" wheels.

https://www.tyre-shopper.co.uk/?gclid=E ... lsrc=aw.ds

look under 'tyre size'

here to help.

Re: 155 Nankang or 145 Bridgestone

Posted: Wed Feb 13, 2019 7:03 pm
by ManyMinors
ampwhu wrote:
Wed Feb 13, 2019 5:38 pm
in regards to the question above on whether the revs would be higher on a car with 145 or 155 tyres, this is irrelevant.

those dimensions are the width, not the height of the tyre.

revs would change if you went from 145/80/14 down to 145/65/14. the tyre would be slimmer so the wheel would need to rotate faster. same applies if you fitted 13" wheels instead of 14" wheels.

https://www.tyre-shopper.co.uk/?gclid=E ... lsrc=aw.ds

look under 'tyre size'

here to help.
No. I'm afraid it is you that is confused ampwhu. Although the 145 or 155 measurement is indeed the width of each tyre, the width does affect the radius. An 80 profile tyre, which these are, means that the sidewall measurement is 80% of the width. Therefore, 80% of 155mm is larger than 80% of 145mm and therefore is a tyre with a larger radius which therefore alters the overall gearing.

Re: 155 Nankang or 145 Bridgestone

Posted: Sun Feb 24, 2019 12:12 am
by ampwhu
on a road car, all your mathematics are useless. fit a better diff and the tyre size is not worth worrying about.

its a MM not a Ferrari.

Re: 155 Nankang or 145 Bridgestone

Posted: Sun Feb 24, 2019 9:41 pm
by liammonty
ampwhu wrote:
Sun Feb 24, 2019 12:12 am
on a road car, all your mathematics are useless. fit a better diff and the tyre size is not worth worrying about.

its a MM not a Ferrari.
So you’re saying that if the tyre diameter is different because of the wheel size then it DOES make a difference, but if the tyre diameter is different because it’s 80% of a different width, then it isn’t actually different, because it’s not a Ferrari?!! To be fair, ManyMinors’ maths weren’t useless at all...

Re: 155 Nankang or 145 Bridgestone

Posted: Mon Feb 25, 2019 9:27 am
by philthehill
You can have wheels of a different diameter fitted with different section tyres and still end up with the same rolling radius.
img302.jpg
img302.jpg (1.16 MiB) Viewed 420 times

Re: 155 Nankang or 145 Bridgestone

Posted: Mon Feb 25, 2019 10:34 am
by Sleeper
Phil
I don't suppose they made any mention of tyre pressures?

John :cry:

Re: 155 Nankang or 145 Bridgestone

Posted: Mon Feb 25, 2019 10:49 am
by liammonty
philthehill wrote:
Mon Feb 25, 2019 9:27 am
You can have wheels of a different diameter fitted with different section tyres and still end up with the same rolling radius.
img302.jpg
Indeed Phil, but I suspect we are agreed that 80% of 145mm is less than 80% of 155 mm when both tyres are 14”, which is the’diameter’ I am referring to.