Rim width confusion

[ollyc98]

Dunno if anyone can help with this. My wheels are listed in the manual as 4.5bx13 (I know, really wide) was just wondering what the 'b' means rather than the normal 'j' that would be after the rim width.


Thanks

 

[Shaun]

I think it has something to do with the contour?

 

[markbognor]

It does indeed describe the contour of the rim, called the tyre bead profile, apparently.

http://www.carbibles.com/tyre_bible_pg4.html

 

[ollyc98]

Thanks for that, now I get it. Does this mean I need specific tyres or will garden variety rubber be ok?

 

[Shaun]

I think you would be ok with standard tyres as i have never seen a specific "B" tyre.
i'm sure when you go ahead with it the local garage etc. should know what they are doing.