Mike Bees Posted April 29, 2005 Share Posted April 29, 2005 I've got a boxed pair of these from Caterham. The box says ET24. I fitted one (gently) and it fouled on the DD tube. Took it off, looked inside, thought "blimey that's dinged it, it's made of cheese" and then noticed that the casting says ET5. Took the other one out of the box, it's also ET5 and it's also identically dinged so someone's had a go at fitting that one too. Took a tape measure to a wheel - total width from outer rim to outer rim is 8". Backdepth from contact face to outer rim is ~126mm. So that gives approx ET24. So why does the casting say ET5 Is it normal to have to take a fair amount of meat off the DD tube to get these to fit? How much clearance should I aim to achieve between the tube and the wheel at their closest point? Mike Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted April 29, 2005 Leadership Team Share Posted April 29, 2005 Mike - my cars a '95 DeDion and I needed to grind quite a bit off the ends of the tube. However, It was only necessary to grind the top and bottom rounded corners - the mid section (vertically between the corners) was fine. There's a massive amount beyond the weld anyway. The clearance I have is now around 3mm - no issues yet discovered Stu. Link to comment Share on other sites More sharing options...
Mike Bees Posted April 29, 2005 Author Share Posted April 29, 2005 Thanks Stu. Bit puzzled about the ET5 on the wheels though! Mike Link to comment Share on other sites More sharing options...
Irrelevant Posted April 29, 2005 Share Posted April 29, 2005 I'd be a bit puzzled why they were 8" wide If you assume they are 8" wide and do the maths, does it come out to ET5? If so, I think you have some incorrectly boxed ET5 8" Minilites. Did they come from Millwood, they sell 8" Minilites and could have got them muddled up? Suffering serious sprint cold-turkey. Must get this finished Link to comment Share on other sites More sharing options...
Iain A Posted April 29, 2005 Share Posted April 29, 2005 Had the same question with my 31" x 7" compomotive MLs... I measure the offset at 24 mm but they are stamped ET15. When I checked with the supplier I was told that they are stamped with the minimum offset that those castings can be machined to... not what they actually are. Confusing huh? Link to comment Share on other sites More sharing options...
Mike Bees Posted April 29, 2005 Author Share Posted April 29, 2005 They came from Caterham (Dartford). I wondered about the 8" thing myself - they're 7" across the seating area measured just inside the rim. The offset if from the 'centre' so if you add/remove the same amount from either side then it doesn't change. Thanks Iain, that makes sense even if it is confusing! Mike Link to comment Share on other sites More sharing options...
Graham Perry Posted April 29, 2005 Share Posted April 29, 2005 Its quite common to have to remove some of the back end of the tube with the wider tyres. Even with barnby 13 inchers which have a large internal diameter we had to remove a good bit of the tube. Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted April 29, 2005 Leadership Team Share Posted April 29, 2005 All rims are measured for width across the tyre bead face. If a larger width is stated by using the outer face they're lying Stu. Link to comment Share on other sites More sharing options...
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