All Things Mk5 > Mk5 General Area
WHEEL & TYRE FITMENT GUIDE
Kevin37:
This just solved so many wheel and offset questions I was going to ask. Good and informative
Donx22:
If anyone is interested I have actually been doing quite alot of research and dynamic testing at work into tyre and wheel size combinations for a future model that is under devlopment and final stages of prototype testing.
Essentailly tyre stretch cause a stiffer sidewall but also speeds up the response time, for example a steering input. this is why BMW actually use a small amount of stretch on their wheels and why the S3 will have 18x8 instead of 18x7.5 pescara's on the same size tyre 225/40/18. it makes that car that little sharper as delay is reduced as well as incereasing steering feel and lowering tyre costs for customers (reducing ultimate grip levels also)
obviosuly this is all good up until a point and then performance drops off but apart from helping with clearance/looks it will effect the dynamics of a vehicle and can be used to peoples advantage if done correctly. :driver:
Nice work on the guide Jay! :happy2:
I have an offset/ wheel size/ tyre calcuator in excel that i can stick up if anyone would like, usefull for when drastically changing wheel size. If I can ever help at all or go into more detail, please give me a shout. Self proclaimed dyamics geek :ashamed:
MightyMullet:
Superb guide jay, helps out with many, many queries I'm sure many of us have!
Top Job!
Sent from my iPad using Tapatalk
rex:
I would like to add something to Jay's excellent guide:
Even if tires are said to be 225 wide (for example) the actual width differs from one tire (manufacturer and tire type) to another.
For example:
225/45 R17 Dunlop Direzza 03G have an actual width of 230mm
225/45 R17 Kumho v70a have an actual width of 224mm
225/45/17 Yokohama Advan ad050 have an actual width of 227mm
I had some info about some other tires but I can't find it... Anyway, you guys get the idea: if you have very little clearance watch out for the exact tire width not the declared one...
jonnym:
--- Quote from: Donx22 on December 11, 2013, 04:53:16 pm ---If anyone is interested I have actually been doing quite alot of research and dynamic testing at work into tyre and wheel size combinations for a future model that is under devlopment and final stages of prototype testing.
Essentailly tyre stretch cause a stiffer sidewall but also speeds up the response time, for example a steering input. this is why BMW actually use a small amount of stretch on their wheels and why the S3 will have 18x8 instead of 18x7.5 pescara's on the same size tyre 225/40/18. it makes that car that little sharper as delay is reduced as well as incereasing steering feel and lowering tyre costs for customers (reducing ultimate grip levels also)
obviosuly this is all good up until a point and then performance drops off but apart from helping with clearance/looks it will effect the dynamics of a vehicle and can be used to peoples advantage if done correctly. :driver:
Nice work on the guide Jay! :happy2:
I have an offset/ wheel size/ tyre calcuator in excel that i can stick up if anyone would like, usefull for when drastically changing wheel size. If I can ever help at all or go into more detail, please give me a shout. Self proclaimed dyamics geek :ashamed:
--- End quote ---
Ahh missed this, but likewise i'm interested in all this aswell. I focussed on aerodynamics but obviously this all has a lot to do with overall aerodynamics of car in general. No doubt the minor tweet from 7.5 to 8, had a big difference on the technical side of perforamnce.
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