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Old 10-06-2019, 09:39 AM   #31 (permalink)
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Just an FYI:

There's been a lot of work about measuring RR in car tires in advance of regulations requiring publication of said RR values. One of those things is the difference between testing on a wheel vs a flat surface (rolling road). The result was that there was a very good correlation between the values. I can't seem to find the study on the internet, but I have notes from a conference I attended.

In other words, when it comes to testing RR in car tires, it doesn't matter whether the tires are tested on a flat surface or a large diameter wheel, the values are proportional.

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Old 10-06-2019, 09:58 AM   #32 (permalink)
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The pothole factor is one of the reasons I went to 65 aspect tires v the OEM-supplied 60 tires on my Mazda3. I'm now riding on 20565R16 Ecopias. They're working well.
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Old 10-06-2019, 10:15 PM   #33 (permalink)
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Quote:
Originally Posted by basjoos View Post
Going to a taller sidewall means you are less likely to dent your rims when you hit a pothole.
This, and the fact that 13" tyres used to be considerably cheaper than the 14" ones, were the main reasons why my mom lurked about it a few months ago.
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Old 10-09-2019, 12:55 AM   #34 (permalink)
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Quote:
Originally Posted by hat_man View Post
I believe mine are 5x114mm but I'm not sure about the center hub.
That's where I messed up. Got lots of used tires & wheels & they all fit nicely. Saw one spare, but never used tire mounted on a 5 by 114.3 mm bolt pattern wheel & 40mm offset, just like I needed. Got it for $30. A week later, I REMEMBERED that I FORGOT to measure the center hole. Needed a 67mm center hole, but the wheel was 62mm. Oh, well. I can still use the tire, if I can't find a Lexus buyer, who needs a spare wheel/tire combo.
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Old 10-20-2019, 03:25 PM   #35 (permalink)
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Quote:
Originally Posted by Ecky View Post
....BMW i3 tires: 175/55r20 - tall, narrow, use LRR compounds.....
From another thread, but more appropriate here, with additions:
Years ago, I uprated my 175x70x14 inch short wheels/tires to used 205x65x15 wheels/tires, which are about 8% taller than the 14's. Tho the aspect ratio(middle number) of the tires is "less", the 205 tire width, coupled with the aspect ratio, still gives an 11mm longer sidewall length, which handles the potholes better. My ride is wonderful with the 205s.
However, influenced by this thread in part, I continued to look for used 14 inch tires that were as tall as my 205x65x15 inch wheels/tires, because I kept the 14inch wheels.
Hey, I finally found a used 195x75x14 inch tire that is as tall as my 205x65x15 wheel/tires. The aspect ratio gives an additional 13mm sidewall length to really help on the potholes. Hope to find another 195x75x14 inch tire, but now I can use a 15 inch wheel/tire with the 14 inch wheel/tire, if necessary.


Last edited by litesong; 10-20-2019 at 03:51 PM..
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