v8ian
Posted a lot
Posts: 3,776
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Apr 25, 2016 17:21:26 GMT
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Today I have been playing wheel offsets, I think I have worked out what I need, Can somebody double check before I make a expensive mistake, I have a choice of wheel widths 6" and 7", Running a line the hub to inner edge of the wing is for arguments sake 50mm, which gives a bit of clearance, I think I need a minimum of ET37 with a 7" 40 would be better.
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Atmo V8 Power . No slicks , No gas + No bits missing . Doing it in style.
Austin A35van, very different------- but still doing it in style, going to be a funmoble
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sb
Part of things
Posts: 725 
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Apr 25, 2016 17:47:47 GMT
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So you have 2" between hub face and inner arch?
If so on a 7J ET40 rim would have ~2.5" of rim forward of the hub face. ~5.5" Behind.
If it is a 7" rim and NOT 7J you'll ~2" of wheel forward of the hub face. ~4" behind.
General rule, a wheel is 1" wider lip to lip than its J measurement.
Ill await somebody telling me I'm 100% wrong!
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Last Edit: Apr 25, 2016 17:50:59 GMT by sb
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Apr 25, 2016 17:49:50 GMT
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J is NOT a measurement. It's a shape
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Apr 25, 2016 18:01:26 GMT
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J is NOT a measurement. It's a shape Correct, but it now has a double meaning through common usage by the great unwashed :-) |
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Last Edit: Apr 25, 2016 21:11:02 GMT by nalesutol
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sb
Part of things
Posts: 725
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Apr 25, 2016 18:06:45 GMT
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J is NOT a measurement. It's a shape The J number is however a fixed scale of reference for a 2D dimension. Otherwise called a measurement. You can call it 1 and a half coconuts, its still rightly or wrongly a measurement. |
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ET calculationsDeleted
@Deleted
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Apr 25, 2016 18:19:33 GMT
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J is NOT a measurement. It's a shape The J number is however a fixed scale of reference for a 2D dimension. Otherwise called a measurement. You can call it 1 and a half coconuts, its still rightly or wrongly a measurement. ....errr. Nothing to do with any measurement. It defines the contour of the rim where the bead of the tyre will seat against. Other profiles being B,D, JJ,K,JK, and P..... |
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mylittletony
Posted a lot
Posts: 2,355
Club RR Member Number: 84
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ET calculationsmylittletony
@mylittletony
Club Retro Rides Member 84
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Apr 25, 2016 18:21:53 GMT
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J is NOT a measurement. It's a shape The J number is however a fixed scale of reference for a 2D dimension. Otherwise called a measurement. You can call it 1 and a half coconuts, its still rightly or wrongly a measurement. No. The J has nothing to do with the width. The 7 is the width. J describes the profile of the bead seat. It just so happens to be listed after the width so mistakenly gets used to reference it. Edit: yeah, that ^^ |
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Apr 25, 2016 18:23:02 GMT
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sb
Part of things
Posts: 725
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Apr 25, 2016 18:49:28 GMT
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....errr. Nothing to do with any measurement. It defines the contour of the rim where the bead of the tyre will seat against. Other profiles being B,D, JJ,K,JK, and P..... No. The J has nothing to do with the width. The 7 is the width. J describes the profile of the bead seat. It just so happens to be listed after the width so mistakenly gets used to reference it Yes but as nalesutol said people refer to the number and the 'J' as the width. They are not correct to do so but it is then a measurement of the width. 'Selfie' is now a word, welcome to the world we live in lol. Anyway this is all semantics and not help poor OP with his question! Just remember ET is from the centreline of the wheel. So on a 7" (Not J  ) wheel start at 3.5" forward then take off the ET. Make sure you have clearance to the spring/inner arch and can hit full lock. |
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Last Edit: Apr 25, 2016 18:52:46 GMT by sb
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v8ian
Posted a lot
Posts: 3,776
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Apr 25, 2016 19:03:26 GMT
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So, my ET is 40 coconuts for the 7 Juliet, and the 6 Juliet would be about 28 coconuts
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Last Edit: Apr 25, 2016 19:10:55 GMT by v8ian
Atmo V8 Power . No slicks , No gas + No bits missing . Doing it in style.
Austin A35van, very different------- but still doing it in style, going to be a funmoble
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ET calculationsDeleted
@Deleted
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Apr 25, 2016 19:15:13 GMT
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^^
...Depends. Are you talking Eastern or European coconuts?
That link that Colnerov put up couple of posts back is good. It's errs in your favour by a couple of millimetres, IE bit of leeway before the tyre hits the wheel arch.
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Last Edit: Apr 25, 2016 19:27:07 GMT by Deleted
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ET calculationsDeleted
@Deleted
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Apr 25, 2016 19:22:50 GMT
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Yes but as nalesutol said people refer to the number and the 'J' as the width. They are not correct to do so but it is then a measurement of the width. 'Selfie' is now a word, welcome to the world we live in lol. What part of "J has nothing to do with the width" ,don't you understand ? Lol |
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mylittletony
Posted a lot
Posts: 2,355
Club RR Member Number: 84
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ET calculationsmylittletony
@mylittletony
Club Retro Rides Member 84
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Apr 25, 2016 19:28:38 GMT
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If your 7" rim is roughly 8" total outside width, and you only have 2" from hub to arch, then you'll need 2" offset. 6" rim would be closer to 7 outside width. You'd need 1.5" in that case, or 37mm. Www.willtheyfit.com might be useful too, although compares new to old |
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sb
Part of things
Posts: 725
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Apr 25, 2016 19:30:45 GMT
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Yes but as nalesutol said people refer to the number and the 'J' as the width. They are not correct to do so but it is then a measurement of the width. 'Selfie' is now a word, welcome to the world we live in lol. What part of "J has nothing to do with the width" ,don't you understand ? Lol What part of 'I get it' do you not understand? The point is to help v8ian with his wheels not get in a bizarre curse word match over the letter J... |
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Last Edit: Apr 25, 2016 19:43:53 GMT by sb
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markbognor
South East
 
Posts: 9,970
Club RR Member Number: 56
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ET calculationsmarkbognor
@markbognor
Club Retro Rides Member 56
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Apr 25, 2016 19:43:11 GMT
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Have you drawn it out as a picture ian, draw the hub face as a vertical line, the arch lip as another. Then you can position your 7" width as a horizontal line between, mark the centre of it and measure to the hub face line.
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v8ian
Posted a lot
Posts: 3,776
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Apr 25, 2016 19:44:27 GMT
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Yes but as nalesutol said people refer to the number and the 'J' as the width. They are not correct to do so but it is then a measurement of the width. 'Selfie' is now a word, welcome to the world we live in lol. What part of "J has nothing to do with the width" ,don't you understand ? Lol Even Wheel Companies use the nomenclature of J to size their rims, I remember an old Dunlop ad using J as a sizing, I have been building cars for far too many years not to know the wheel width is measured from the inside edge of the tire seat, and to be safe add 25mm to the "J" size to get the aprox width of the rim, sometimes much less than that depending on manufacturer or design...... Anyway, I like Coconuts for sizing  |
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Atmo V8 Power . No slicks , No gas + No bits missing . Doing it in style.
Austin A35van, very different------- but still doing it in style, going to be a funmoble
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Apr 25, 2016 19:48:58 GMT
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i think the sizing should be in Gorillas............
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Needs a bigger hammer mate.......
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ET calculationsDeleted
@Deleted
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Apr 25, 2016 19:53:14 GMT
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This was posted in an ad on this here parish today  J wheel with a JJ profile. |
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ET calculationsDeleted
@Deleted
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Apr 25, 2016 19:57:01 GMT
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Any luck with finding your 5,9 coconut diameter EN1a?
Was that for spacers?
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Last Edit: Apr 25, 2016 19:57:46 GMT by Deleted
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) wheel start at 3.5" forward then take off the ET. Make sure you have clearance to the spring/inner arch and can hit full lock.
