djoptix Posted August 12, 2017 Share Posted August 12, 2017 I didn't consider it shite enough for this forum, but last week I picked up Bertie the Berlingo, Mrs Optix's new ride. It needs two rear tyres, and I have a set of wheels from my last C5 that I was hoping to use. The tyres on it are 195/65/15. The tyres on the new wheels are 205/65/15 - close but 6.35mm bigger radius. Annoyingly, the wheels on it now are already slightly bigger than standard. tl;dr the new tyres are only 2-3mm off the bottom spring cup at the front. Is this too close? I think probably yes... allowing for a bit of flex under cornering, tyres expanding ever so slightly at speed/when hot... Link to comment Share on other sites More sharing options...
DodgeRover Posted August 12, 2017 Share Posted August 12, 2017 Try it and see if you get any marks under cornering. Link to comment Share on other sites More sharing options...
hairymel Posted August 13, 2017 Share Posted August 13, 2017 ^this Link to comment Share on other sites More sharing options...
cobblers Posted August 13, 2017 Share Posted August 13, 2017 I've run loads of stuff as close as that, it should be fine overrun 1 Link to comment Share on other sites More sharing options...
Bucketeer Posted August 13, 2017 Share Posted August 13, 2017 There's a thread for questions - http://autoshite.com/topic/26894-stupid-question-amnesty/page-510 Link to comment Share on other sites More sharing options...
Pillock Posted August 13, 2017 Share Posted August 13, 2017 I always thought the SQA thread was for ponderings and musings (like, "what was the last car to have a brown wire connecting the speedometer light to the fuse box") and we were OK to have a separate thread along the lines of "This has happened and I need someone to tell me whether kittens are going to die". Makes stuff easier to find too. Just my tuppence. Anyway, I too have run stuff that close without issue. Sidewall flex tends to be at the bottom and you'll not get much lateral movement at the top. Link to comment Share on other sites More sharing options...
overrun Posted August 13, 2017 Share Posted August 13, 2017 I didn't consider it shite enough for this forum, but last week I picked up Bertie the Berlingo, Mrs Optix's new ride. It needs two rear tyres, and I have a set of wheels from my last C5 that I was hoping to use. The tyres on it are 195/65/15. The tyres on the new wheels are 205/65/15 - close but 6.35mm bigger radius. Annoyingly, the wheels on it now are already slightly bigger than standard. tl;dr the new tyres are only 2-3mm off the bottom spring cup at the front. Is this too close? I think probably yes... allowing for a bit of flex under cornering, tyres expanding ever so slightly at speed/when hot... My MR2 runs fag paper close, and there are zero rubbing issues. Link to comment Share on other sites More sharing options...
djoptix Posted August 14, 2017 Author Share Posted August 14, 2017 Thanks all, and I am happy to have this deleted/moved to SQA if appropriate. BUT I should have clarified I'm not talking about lateral clearance where sidewall flex would be the issue, but clearance over the tread of the tyre itself - the spring cup overhangs the tread. Does that change anyone's view on the matter? Sorry, I can see how this was confusing because I'm clearly talking about tyres that are wider, but because tyre size calculations are from the devil, this means the tyre is very slightly bigger in diameter, as well as obviously being 10mm wider overall. I'm aware I could put tyres on it and go and hammer it round some corners, but it isn't insured or taxed at the moment and I have no wish to put any money in the pockets of the insurance industry/the Dervla until necessary. Link to comment Share on other sites More sharing options...
DodgeRover Posted August 14, 2017 Share Posted August 14, 2017 I would think if you are running the correct pressures it wouldn't be an issue Link to comment Share on other sites More sharing options...
New POD Posted August 14, 2017 Share Posted August 14, 2017 And provided there's no free play in the bearings Link to comment Share on other sites More sharing options...
Mr_Bo11ox Posted August 14, 2017 Share Posted August 14, 2017 If you think the risk is on the diameter of the tyre, driving it hard round corners isn't gonna prove owt. Just drive it as fast as you dare to check for centrifugal growth and listen for funny noises/check the tyres for grooves after! If you get a whirr at 84mph you know you're limited to 83 till you've worn some tread off! Lovely! Link to comment Share on other sites More sharing options...
lisbon_road Posted August 14, 2017 Share Posted August 14, 2017 OK not really answering the question. I have found before that a car fitted with the wrong size tyres just looks wrong at a glance. I'd trade 'em at a co-operative secondhand tyre dealer for the right size, sleep well and know it looks ok. Just my opinion. Link to comment Share on other sites More sharing options...
DodgeRover Posted August 14, 2017 Share Posted August 14, 2017 Are you sure what's on were the right size to begin with ? Link to comment Share on other sites More sharing options...
djoptix Posted August 14, 2017 Author Share Posted August 14, 2017 And provided there's no free play in the bearings At least that's one thing I can be sure of, both of the bearings are brand new at vast expense. Are you sure what's on were the right size to begin with ? Excellent question sir. No, they aren't, they're slightly bigger than standard themselves. OK not really answering the question. I have found before that a car fitted with the wrong size tyres just looks wrong at a glance. I'd trade 'em at a co-operative secondhand tyre dealer for the right size, sleep well and know it looks ok. Just my opinion. Fair point. Hmm.... Link to comment Share on other sites More sharing options...
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