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May 11, 2016 12:21:25 GMT
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In the past I've always been under the impression that you need to maintain an original vehicle's wheel thread length. i.e if you fit 5mm wheel spacers then you should fit wheel studs (or bolts) that are 5mm longer. However I've been thinking about 25mm bolt-on spacers and how they only use upto 25mm of thread length so does that mean it's fine to fit wheels to 25mm of thread length too? Providing of course that the actual wheel mounting thickness doesn't take up too much of that stud lengthage!! I mean when a wheel nut is tight it's tight isn't it? and when it comes loose how many millimetres does it take before it results in total wheel escapage? Thanks in advance and apologies if i've missed any nun-killing / kitten-drowning obvious things in my presumptions. oh and yes i have cut springs and lived to tell the tale in the past.  |
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steveg
Posted a lot
Posts: 1,586
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May 11, 2016 13:14:24 GMT
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I think it's more the strength of the thread thats the problem rather than loosening of the bolt. If you think about the thickness of material where a stud goes through a hub or halfshaft it isn't much and they are strong enough, they are normally decent quality steel though.
Alloy bolt on spacers shouldn't be any less than 25mm thick as any stud or thread inserts don't end up with much holding them in, the thicker the better really especially with bolts.
I've got spacers on my Volvo but went for ones with studs.
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Last Edit: May 11, 2016 13:16:14 GMT by steveg
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slater
Club Retro Rides Member
Posts: 6,390
Club RR Member Number: 78
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A good rule of thumb is to have the minimum of one diameters worth of full threads engaged so a 12mm bolt will need 12mm or more deapth of thread to screw into. Ofcourse the more the merrier and I'd definitely urge on the deeper side with critical joints but yes in most cases you can generally get away with adding thin wheel shims while still using the original studs/bolts.
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Thanks slaterSounds like I should be okay then. I'm not actually fitting spacers I was just using that as an example because the studs are shorter in length than standard but I still think there's enough thread for them to be safe. I.e if there's enough thread for bolt-on spacers then there's enough thread for wheels. |
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May 12, 2016 16:58:54 GMT
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I was always told (rightly or wrongly) that as long as you get atleast 7 full revolutions of the wheel nut/bolt then that will be enough.
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MrSpeedy
East Midlands
www.vintagediesels.co.uk
Posts: 4,791 
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May 12, 2016 17:12:37 GMT
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Thanks slaterSounds like I should be okay then. I'm not actually fitting spacers I was just using that as an example because the studs are shorter in length than standard but I still think there's enough thread for them to be safe. I.e if there's enough thread for bolt-on spacers then there's enough thread for wheels. If your hubs are fitted with studs, and the wheels secured with loose nuts, then anything more than a full nut is superfluous* If you have loose bolts, then again, as Slater says the diameter of the thread should also be the length as a ROT. 1 1/2 times diameter is optimal, and again, anything more is unnecessary. *yes, I did google it to check spelling :/ |
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