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Car Forum / UK Car Forums / 4x4 Cars (UK group) / January 2005Rim size
How do you measure rim diameter - at its widest point (do-able with the tyre on), or inside the rims with the tyre off?  SignatureR o o n e y > How do you measure rim diameter - at its widest point (do-able with > the tyre on), or inside the rims with the tyre off? check closely around the rim it should be stamped on with width details Derek inside the rims with the tyre off ....is correct > How do you measure rim diameter - at its widest point (do-able with > the tyre on), or inside the rims with the tyre off? At the widest point on the rim. A 16.9/30 tyre is usually mounted on a 14'' wide rim and indeed this tyre size used to be called a 14/30. It is now sadly called a 420/85R30 but that is progress I suppose. Huw >> How do you measure rim diameter - at its widest point (do-able with >> the tyre on), or inside the rims with the tyre off? [quoted text clipped - 5 lines] > >Huw I just found a site that says otherwise, Huw, and ditto for width (ie, don't count the lip). I ask because my documentation says 16" alloys, my tyres say 16, but rim to rim at the widest is nearer 17". The rim size in inches is still on my tyres, along with other info. I have 235/70 R16 105H, which tells it all. SignatureR o o n e y >>> How do you measure rim diameter - at its widest point (do-able with >>> the tyre on), or inside the rims with the tyre off? [quoted text clipped - 8 lines] > I just found a site that says otherwise, Huw, and ditto for width (ie, > don't count the lip). Then 'otherwise' to what? I ask because my documentation says 16" alloys, > my tyres say 16, but rim to rim at the widest is nearer 17". The rim > size in inches is still on my tyres, along with other info. I have > 235/70 R16 105H, which tells it all. Yes, 235mm wide, 70% profile, radial on 16'' diameter rims with a load rating. It might also have a wear rating somewhere. This size sounds like a common one for Series11 Discovery. In my experience it is certainly the best width of tyre to suit a Discovery for most occasions. Wide enough to grip while not being too wide such that it just spins uselessly on slippery mud and grass. Huw >Then 'otherwise' to what? That you measure from below the rim on the inside, not from the widest bit on the outside. > I ask because my documentation says 16" alloys, >> my tyres say 16, but rim to rim at the widest is nearer 17". The rim [quoted text clipped - 7 lines] >occasions. Wide enough to grip while not being too wide such that it just >spins uselessly on slippery mud and grass. They came with the car (Terrano). I was browsing the net for winter tyres and snow chains (being an optimist!) and it made me wonder about what the measurements referred to, exactly. Had fun yesterday driving through a couple of feet of water at a ford near Rhuthin. And some nice steep muddy lanes too. But I've not done much off road yet. SignatureR o o n e y >>Then 'otherwise' to what? > > That you measure from below the rim on the inside, not from the widest > bit on the outside. Yes the widest point where the tyre is in contact with the rim. The bead width if you like. >> I ask because my documentation says 16" alloys, >>> my tyres say 16, but rim to rim at the widest is nearer 17". The rim [quoted text clipped - 16 lines] > near Rhuthin. And some nice steep muddy lanes too. But I've not done > much off road yet. You have a nice modern Terrano then. Mine has 215/75r15 on it. Steel ones. Huw >You have a nice modern Terrano then. Mine has 215/75r15 on it. Steel ones. > >Huw Virgin had brand new imported ones (full UK spec) at £6000 below list price earlier this year. No CD or sunroof - but they aren't worth six grand. Not bad at all - 3 years Nissan warranty, ABS, EBD, alloys, 4 eleccy windows, air con, 7 seats, etc. I don't think there are any left at that price. SignatureR o o n e y |
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