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Post by Paulus17 on Nov 30, 2024 9:29:41 GMT
Thank you for the info Bob and Charlie👍🏻
We have got to go out in the Rav today on a longer journey today but Mrs P is now more concerned about the Ravs safety, I’m sure it’ll be fine so we will just take it steady and see if things improve🤞🏻
I did ask a few people who have made the same change if they’d encountered any issues but all said it was fine, so perhaps Bothy is right we’ll have to check the suspension but all that was fine before the change.
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Post by Paulus17 on Nov 30, 2024 9:30:53 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.
Chris I can weigh the wheels as the spare is still off so will let you know later👍🏻 |
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Post by philip42h on Nov 30, 2024 10:03:51 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 👍👍  The above chart shows a change of offset - ET50 to ET30. I'd be a little concerned if that is not a typo ...? The change in overall diameter is very small and the impact on the speedo is pretty much irrelevant - it is in the 'wrong' direction but you'll have more than enough latitude in the system anyway. The sidewall height is 92% of what it was before. The rims won't flex [much] but the sidewall will so the ride will be 8% less comfortable. You'd probably get used to that in a day or so. |
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Post by unclebob on Nov 30, 2024 11:16:32 GMT
I would never give up our RAV4’s 60 series profile tyres as living in the suburbs of London the potholes are a joke !
Potholes, speed humps, speed platforms all the obstacles of suburban life .
Paul with your wheels and tyres it should be more sure footed along sweeping lanes, and handle a little better . Downside might to a slightly harsher ride.
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RAV4 No4
Nov 30, 2024 13:36:35 GMT
via mobile
Post by charliefarlie on Nov 30, 2024 13:36:35 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 👍👍 The above chart shows a change of offset - ET50 to ET30. I'd be a little concerned if that is not a typo ...? The change in overall diameter is very small and the impact on the speedo is pretty much irrelevant - it is in the 'wrong' direction but you'll have more than enough latitude in the system anyway. The sidewall height is 92% of what it was before. The rims won't flex [much] but the sidewall will so the ride will be 8% less comfortable. You'd probably get used to that in a day or so. My input for the comparison was restricted to the wheel and tyre sizes because that’s all I had . Wheel width and offset I just didn’t have but I don’t think either would make much difference … The numbers that matter is the wheel / tyre sizes.. 8% maybe but I know from experience with quite a few cars in the past that every inch extra to rim size combined with reduction in side wall can make quite a difference and more than the numbers suggest .. I said above that Paul likely won’t notice after a week or two but if it irritates it irritates.. When I was younger I could have put up with the trade off but not now I’d rather have a compliant ride … |
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Post by philip42h on Nov 30, 2024 14:43:30 GMT
That's OK Charlie ...
It may be worth checking the offset numbers to ensure that they are the same. A reduced offset would have the effect of pushing the wheel centres out wider and changing the suspension geometry. Exactly how significant an effect that would have I don't know, but I seems not to be a good idea (to me). Worth a check even if only to discount ...
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Post by charliefarlie on Nov 30, 2024 16:43:07 GMT
That's OK Charlie ... It may be worth checking the offset numbers to ensure that they are the same. A reduced offset would have the effect of pushing the wheel centres out wider and changing the suspension geometry. Exactly how significant an effect that would have I don't know, but I seems not to be a good idea (to me). Worth a check even if only to discount ... Perhaps Paul can give us the offsets and wheel widths ? I completely understand the effect that offset can mean and David made an excellent point above about the weights of the wheels with tyres for both old and new sets. Unsprung weight is something engineers of cars especially performance cars try to keep to a minimum…. Add all the various changes together and it could make such a difference, When I was racing bikes back around 2002 I found a set of Carbon fibre wheels for my R1 1000cc race bike. They were so light it beggared belief. The change in unsprung weight meant so much difference the compression and rebound setting had to be altered significantly. The gyroscopic effect with less weight meant the bike could be flicked onto its side or from side to side so much faster and with ease… Unsorung weight. Been there for sure 👍👍👍 |
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Post by Paulus17 on Nov 30, 2024 17:45:36 GMT
Ok so it’s getting technical now for me but would I be able to get the offset with the wheels off the Rav by measuring the back inside of the wheels, what if the inner depth of both wheels rims measured the same width?
I also managed to quickly weigh the two wheels before we went out, the TTE wheel with tyre is 38-40lb, the original wheel with tyre is 42-46lb. I weighed each wheel twice using suitcase scales😁
After Saying all that the ride out today was a lot lot better, the tyres felt softer and no bouncing even going over potholes which were plentiful, it didn’t feel as hard as when the previous wheels and tyres went over a bad pothole, so if this had have been our first ride out today I wouldn’t be questioning anything but saying the wheels felt great 👍🏻
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Post by davrav on Nov 30, 2024 17:55:20 GMT
 The TTE wheel offset is 35mm |
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Post by philip42h on Nov 30, 2024 17:55:43 GMT
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Post by charliefarlie on Nov 30, 2024 18:18:20 GMT
Ok so it’s getting technical now for me but would I be able to get the offset with the wheels off the Rav by measuring the back inside of the wheels, what if the inner depth of both wheels rims measured the same width? I also managed to quickly weigh the two wheels before we went out, the TTE wheel with tyre is 38-40lb, the original wheel with tyre is 42-46lb. I weighed each wheel twice using suitcase scales😁 After Saying all that the ride out today was a lot lot better, the tyres felt softer and no bouncing even going over potholes which were plentiful, it didn’t feel as hard as when the previous wheels and tyres went over a bad pothole, so if this had have been our first ride out today I wouldn’t be questioning anything but saying the wheels felt great 👍🏻 That’s quite a significant weight saving which should work in your favour, Did you reduce the tyre pressures Paul ? |
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Post by philip42h on Nov 30, 2024 18:21:42 GMT
Charlie's comparison redone with what I understand to the the correct rim sizes:  You need the reduced offset (ET45 > ET30) to avoid the wheel fouling on the suspension strut / arch etc. - so, basically, ignore me, it all seems fine!  |
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Post by Paulus17 on Dec 1, 2024 11:41:58 GMT
I’ve just looked at the original wheel but can’t see anything with ET, only thing resembling it is the letters ZW and 35 below those🤷🏻♂️
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Post by Paulus17 on Dec 1, 2024 11:43:16 GMT
This is it  |
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Post by unclebob on Dec 1, 2024 12:33:37 GMT
Paul is there another figure like 7 x 17 or 7.5 x 17 ?
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