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Post by Paulus17 on Nov 29, 2024 15:51:16 GMT
Ok folks so the new wheels and tyres are on and we finally got to go out yesterday in the Rav and first thing we noticed was that it seemed to be bouncing up the road more so from the back end it felt.
Second thing was it felt hard on the road😒
So got it back home and I checked the tyre pressures they were all spot on at 32lb and checked the wheel nuts which were all fine.
I was assured that the wheels were all checked for any defects before stripping etc and was told that they were, so what could be causing these issues?
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Post by charliefarlie on Nov 29, 2024 18:32:04 GMT
Ok folks so the new wheels and tyres are on and we finally got to go out yesterday in the Rav and first thing we noticed was that it seemed to be bouncing up the road more so from the back end it felt. Second thing was it felt hard on the road😒 So got it back home and I checked the tyre pressures they were all spot on at 32lb and checked the wheel nuts which were all fine. I was assured that the wheels were all checked for any defects before stripping etc and was told that they were, so what could be causing these issues? Have you fitted the same size wheels and the same profile tyres ? Remind me to save me reading it all again and to eliminate confusion ? |
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Post by Paulus17 on Nov 29, 2024 20:28:29 GMT
Hi Charlie.
I have changed from the standard 16” wheels to the 17” wheels off a Granite that a lot of Rav users have done.
Tyre size on the original wheels are 235x60x16”
Tyre size on Granite wheel is 235x55x17”
The nuts on the original wheels are flat edge while the nuts on the granite are tapered which I’ve used and came with the wheels.
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Post by charliefarlie on Nov 29, 2024 20:39:53 GMT
Hi Charlie. I have changed from the standard 16” wheels to the 17” wheels off a Granite that a lot of Rav users have done. Tyre size on the original wheels are 235x60x16” Tyre size on Granite wheel is 235x55x17” The nuts on the original wheels are flat edge while the nuts on the granite are tapered which I’ve used and came with the wheels. So a slightly larger wheel and a slightly reduced the wall profile. There’s your answer Paul. 1 inch is a lot when it comes to the effect on ride quality. The smaller the wheels and the taller the tyre wall profile the more comfortable and compliant the ride will be. Some tyres have stiffer side walls than others but if I recall you went for Vredestien quatracs which are known for being soft as most all season or winter tyres are…… Both winter tyres and all season tyres feature slightly softer tyre walls as the movement generates heat which tyres of that kind need. Give it a week or two and you’ll likely get used to how it is. I used to run my old T180 on pure winter tyres with pressures of 30PSI instead of 32 as that was what Vredestien recommended. I would look into if that’s a good idea if I were you. 👍👍👍 |
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Post by davrav on Nov 29, 2024 20:41:21 GMT
Hmmm so only slightly lower profile but sidewalls will be a bit less squishy [technical term there].
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Post by Paulus17 on Nov 29, 2024 21:07:55 GMT
Thanks both but would the change in wheel/tyre size account for the bouncy feeling?
I’ve also been looking on line and some say changing to a bigger wheel can have an effect on suspension, gears, and drive and speedo. Would this change have that much of an affect.
I will try reducing the tyre pressure Charlie to see if it makes it a bit more squishy😂
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Post by charliefarlie on Nov 29, 2024 21:13:44 GMT
Hmmm so only slightly lower profile but sidewalls will be a bit less squishy [technical term there]. Exactly. The lower the profile the stiffer the sidewall. As an old dear departed mate used to say the tyres are an integral part of the suspension…. When I had that wee VW GTI the guys on the owners forum were queueing up to ditch the standard 17 inch rims in favour of 16s. That said the sidewall dimensions on those cars was really low. Same with the MX5 everyone wanted the looks of the 17s but few wanted the ride quality…. 1 inch difference is much more than the numbers suggest .. |
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Post by charliefarlie on Nov 29, 2024 21:18:51 GMT
Thanks both but would the change in wheel/tyre size account for the bouncy feeling? I’ve also been looking on line and some say changing to a bigger wheel can have an effect on suspension, gears, and drive and speedo. Would this change have that much of an affect. I will try reducing the tyre pressure Charlie to see if it makes it a bit more squishy😂 If the overall size is changed the rolling radius can increase or decrease which alters the amount of times the wheel turns up or down. So the speedo will over or under read.. There is a web page where you can input the standard wheels and tyres and any proposed changes and it will tell you exactly what the effect will be. Harder shallower side walls will by virtue of making the ride harder can a,so have the effect of a slightly bouncier ride…. |
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Post by charliefarlie on Nov 29, 2024 21:20:19 GMT
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Post by unclebob on Nov 29, 2024 21:24:47 GMT
Thanks both but would the change in wheel/tyre size account for the bouncy feeling? I’ve also been looking on line and some say changing to a bigger wheel can have an effect on suspension, gears, and drive and speedo. Would this change have that much of an affect. I will try reducing the tyre pressure Charlie to see if it makes it a bit more squishy😂 Paul the gears and Speedo will be spot on, I’ve looked up the calculation for the new tyres and almost identical circumference to the old ones 👍🏻👍🏻 235/60/16 speedo reading 30 mph 235/55/17 Speedo reading 29.92 mph. |
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Post by charliefarlie on Nov 29, 2024 21:33:08 GMT
Very little rolling radius difference ….. My dyslexia has gone into overdrive so I can’t tell you the effect of the change will have on your speedometer. Someone else will though 👍👍  |
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Post by unclebob on Nov 29, 2024 22:19:11 GMT
10% is the max but the chart above shows 0.28%…thats absolutely nothing 👍🏻
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Post by charliefarlie on Nov 30, 2024 7:28:12 GMT
10% is the max but the chart above shows 0.28%…thats absolutely nothing 👍🏻 It isn’t. But it points out that the changes equal 1 inch extra wheel size equals 1 inch less in the tyres sidewall. That’s not insignificant.. And is clearly to blame for Paul’s trade off in ride quality…. 👍👍 |
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Post by three5 on Nov 30, 2024 7:44:20 GMT
Thanks both but would the change in wheel/tyre size account for the bouncy feeling? I’ve also been looking on line and some say changing to a bigger wheel can have an effect on suspension, gears, and drive and speedo. Would this change have that much of an affect. I will try reducing the tyre pressure Charlie to see if it makes it a bit more squishy😂 Paul, what is the comparative weight of the 16" and 17" wheels with the tyres fitted? A change in unsprung weight could be having an effect here, particularly if the shock absorbers have a lot of miles/years on them.
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Post by bothwellbuyer on Nov 30, 2024 9:07:13 GMT
I have 245/45 18 Falken AS210 all weather tyres on my 2002 3 door. A harder ride, but much more assuring on roundabouts😂
I've alloys on which are probably lighter.
I get more road noise on some tar surfaces.
I'd check your rear springs and shocks.
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