| [ Total Views: 2315 | Total Replies: 16 | Thread Id: 93381 ] |
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 Redbackemu
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| posted on October 25th, 2011 at 07:21 PM |
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Tyre width to fit standard Baja rear axle
Just wondering if I will have any clearance problems with 15 x 7 rims running 31 x 10.5 rubber on rear of standard 1970 baja
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Anthiron
A.k.a.: Nicko McKay
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| posted on October 25th, 2011 at 07:53 PM |
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Depends on the offset of your rims. I have run 10 inch rims with 31's no problem however they had almost no backspace.
Do you have long or short torsion bars? If you have the long bars that sit in front of the tyre then you may rub here if you go bigger than 31's.
Otherwise you may rub in the wheel housing at full compression if the offset isnt right.
Nicko
62/60 model bug eye baja bug, (Full Build in Progress)
1974 Chevrolet Luv
1970 MK2 Ford Cortina GT
1979 Yamaha RX125 Two Stroke tracker project.
2004 Harley Davidson Sportster XL Custom
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Redbackemu
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| posted on October 25th, 2011 at 08:48 PM |
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Just new to this wheel game, can you explain what the offset means, not sure of the torsion bar length, I will have a look, but it will be whatever
came standard on a 1970 beetle, there has been no suspension mods done
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Anthiron
A.k.a.: Nicko McKay
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| posted on October 25th, 2011 at 09:56 PM |
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http://en.wikipedia.org/wiki/Offset_%28wheel%29
As for the torsion bars. Look at the end caps that cover where the spring plates attach to the torsion bars.
the caps will either have a very small raised section or a tube protruding from them. It will be noticeable.
62/60 model bug eye baja bug, (Full Build in Progress)
1974 Chevrolet Luv
1970 MK2 Ford Cortina GT
1979 Yamaha RX125 Two Stroke tracker project.
2004 Harley Davidson Sportster XL Custom
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Aussie Dubbin
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| posted on October 26th, 2011 at 02:52 PM |
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70 "should' be a long axle swinger not irs. Decide on the wheels you have and go from there. You might be able to get an old tyre fitted at a tyre
store. Try ringing around. Probably the best way to find what you want. Remember the guards and ride height can effect clearence.
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Anthiron
A.k.a.: Nicko McKay
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| posted on October 26th, 2011 at 03:14 PM |
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Most Bajas "Should be" a few things but in my experience it is better to check as most offroad cars have had at least a few mods.
62/60 model bug eye baja bug, (Full Build in Progress)
1974 Chevrolet Luv
1970 MK2 Ford Cortina GT
1979 Yamaha RX125 Two Stroke tracker project.
2004 Harley Davidson Sportster XL Custom
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Redbackemu
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| posted on October 26th, 2011 at 08:15 PM |
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rims have 3 &1/4 offset, rear is a swinger. Nico what rims & wheels do you run your Baja in your profile picture
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Anthiron
A.k.a.: Nicko McKay
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| posted on October 26th, 2011 at 09:47 PM |
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I Can't remember what was on it in the Avatar pic.
Currently runs Standard wide 5 4.5inch fronts with 195/80r15 the rears are 8 inch Roh rims with Standard VW centers welded in running 275/80r15
The rears have huge negative offset.
10 inch rims just fit under wide Cheetah style baja guards.
As a side note.....Why 10inch rims? extra weight, if you run a big negative offset it will put more load on the bearings and unneccesary for 31's.
62/60 model bug eye baja bug, (Full Build in Progress)
1974 Chevrolet Luv
1970 MK2 Ford Cortina GT
1979 Yamaha RX125 Two Stroke tracker project.
2004 Harley Davidson Sportster XL Custom
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Anthiron
A.k.a.: Nicko McKay
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| posted on October 26th, 2011 at 09:48 PM |
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Also I found the gearing far too high on 31's
62/60 model bug eye baja bug, (Full Build in Progress)
1974 Chevrolet Luv
1970 MK2 Ford Cortina GT
1979 Yamaha RX125 Two Stroke tracker project.
2004 Harley Davidson Sportster XL Custom
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Redbackemu
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| posted on October 27th, 2011 at 08:00 PM |
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the rear rims I was looking at were 15 x 7 (3&1/4 negative offset) not 10", I was wondering if they would run the same tyres as I have on my
hilux which are 31 X 10.5. but sounds like I should drop the tyre size how about 29's
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Anthiron
A.k.a.: Nicko McKay
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| posted on October 27th, 2011 at 08:35 PM |
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If you have a low ratio box and a larger than stock engine you will be fine. 29's will be more workable
62/60 model bug eye baja bug, (Full Build in Progress)
1974 Chevrolet Luv
1970 MK2 Ford Cortina GT
1979 Yamaha RX125 Two Stroke tracker project.
2004 Harley Davidson Sportster XL Custom
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Smiley
A.k.a.: Daniel Stephens
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| posted on October 27th, 2011 at 08:53 PM |
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It all depends on the ratios.
My first Baja had no dramas cruising along at all. And it was running 31" rear tyres and a stock 1300 single port engine.
But it had the mid 60's 6V swingaxle box which has a 4.375 diff and 0.89 4th gear.
The standard swingaxle box that you have in you can should be
1st - 3.8
2nd - 2.06
3rd - 1.26
4th - 0.89
Diff - 4.125
This will give you 2474RPM at 100km/h with a 31" tall tyre.
Or 2644RPM at 100km/h with a 29" tall tyre.
If you only have a stock engine (1600 or smaller) it's going to be struggling to push those ratios with a 31". The 29" is a better bet. Unless you
were to consider swapping in an earlier gearbox to make use of the lower ratios. But it's a bit of a backwards step just to run larger tyres.
Hope this has helped.
Smiley 
If you said I was a Volkswagen man, you'd be right.
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Redbackemu
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| posted on October 27th, 2011 at 09:05 PM |
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Thanks for your advice, if running 29's what width tyre is best suited?
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Smiley
A.k.a.: Daniel Stephens
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| posted on October 27th, 2011 at 09:13 PM |
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| Quote: | Originally
posted by Redbackemu
Thanks for your advice, if running 29's what width tyre is best suited?
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Anything from 10" wide down would be fine.
I think you'll find that most manufacturers make a tyre that is 235/75/R15.
That equates to 29.1 inches tall and 9.25 inches wide. Which I think would be perfect for what you want.
Smiley
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PHAT BUG
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| posted on October 30th, 2011 at 12:04 PM |
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Yep I agree,
I wouldn't go any larger than a 235/75, with stock motor and box.
Why not buy some 15x5.5in Mangles (I'm sure them cheap at Wolsburg Auto in Geelong)
A pair of 27's on the front and some 29's on the rear.
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Redbackemu
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| posted on October 30th, 2011 at 06:55 PM |
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Thanks Rhett, have they got a website? what price were they asking ? What do Mangles look like?
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PHAT BUG
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| posted on October 30th, 2011 at 10:00 PM |
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I noticed them advertised in VWMA magazine, Look like stock rims, just wider.
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