| [ Total Views: 925 | Total Replies: 13 | Thread Id: 97616 ] |
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 68AutoBug
A.k.a.: Lee Noonan
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 posted on June 28th, 2012 at 11:51 PM |
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What is the biggest diameter tyre to fit 6 inch wide steel wheels
I have 165 x 15 tyres all round but would like to fit larger diameter tyres to the rear as My semi auto beetle has the 4.375 to 1 differential and
I'm doing around 3600rpm at 100 KMH
I know many tyre sizes are now disappearing but hopefully there is one that will lower My revs at speed..
at a reasonable price..
My wheels are 6 inches wide chromed steel
cheers
LEE
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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waveman1500
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| posted on June 29th, 2012 at 12:34 AM |
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3600rpm at 100km/h doesn't sound that bad. There's a reason that these cars have short gearing, it's because they have the aerodynamics of a brick
and are somewhat underpowered.
In response to your question, Nankang do the CX668 in a 165/80R15, which is about as tall as you're likely to get without going to 4wd or truck
tyres. You could also go to a 205/65R15, which is actually 2.5mm taller than the 165/80R15 and has a bit more meat to it.
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PHAT BUG
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| posted on June 29th, 2012 at 12:53 AM |
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I just swapped my 165/80r15s for 185/80r15s on the back of my bug and I'm very happy with the results. Both in performance and looks..........
Dia has increased from 645mm to 677mm.
New tyres are Hancooks.
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PHAT BUG
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| posted on June 29th, 2012 at 12:56 AM |
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As for the biggest dia I had 787.4mm on 6in rims on my old bug.
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ian.mezz
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| posted on June 29th, 2012 at 08:27 AM |
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215/65/r15 about 26 inch cheap tooooo
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sander288
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| posted on June 29th, 2012 at 09:08 AM |
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You could also use the 205/70/15 tyre and get a bit of a cal-look stance happening
http://www.michelin.com.au/Home/Products-Services/pattern-detail/PassengerCar...
Michelin does tyres in this size in the cheaper XM2 range
http://www.csp-shop.com/cshop/technik/getriebeberechnung5.php
Use the gear ratio calculator above so you can get a real idea of what your revs will be to see if it's worth it though
Cheers
Shaun
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bajachris88
A.k.a.: Chris Leete
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| posted on June 29th, 2012 at 10:15 AM |
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remember, greater rev's = greater cooling (ie: fan rpm speed). i wouldn't aim any less than 3000rpm, but i'm no expert. Would be my gut feeling if
i was in your shoes.
And as the ad says for the 1500 series, "its top speed is its cruising speed", and the top speed would involve revving its nuts till it can't go
any more lol.
(ô_!_/ô) (ô_!_/ô)
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68AutoBug
A.k.a.: Lee Noonan
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| posted on June 29th, 2012 at 01:28 PM |
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ALL air cooled VW cars had the top speed as the cruising speed
as most other makes needed an overdrive to acheive this and most didn't have it..
although many English cars did offer this as an option in later years.. MG with overdrive etc..
in the 50's and 60's not many car makers had the cruising speed as the top speed... lol
When You see all those Baja beetles with huge rear wheels and tyres their engines are working much harder
the 1300 & 1500 semi auto beetles had 4.375 to 1 which is the 1200 manual beetle diff size. Later 1600 semi autos had 4.125 to 1 ratio - similar
things happened with manual beetles with the 3.88 to 1 diff ratio instead of 4.125...
VW doesn't say anything about driving at 80 klms an hour everywhere apart from You get better economy..
I don't think it will make any difference, ..
if I go too big a tyre then I'll be in a lower gear revving the engine more going up hills...
LEE
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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tweety
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| posted on June 29th, 2012 at 07:31 PM |
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A good tyre calculator site
http://www.tacomaworld.com/forum/tirecalc.php
When I had my 1916 in Tweety trike with VW type 3 auto I went from 295/50/r15 to 275/60/r15. 8% larger diameter. Really showed up when towing our
camper trailer in that it didnt like hills and got hotter sometimes overheating...and the camper weighed 300 kgms.
Went back to the 295's
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1303Steve
A.k.a.: Steve Carter
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| posted on June 29th, 2012 at 08:08 PM |
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Hi Lee
As you have a 4 vent engine lid maybe you should aim for a tyre that would give a final drive equal to a 1600 Superbug semi auto.
Steve
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Uber Kafer
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| posted on June 29th, 2012 at 09:44 PM |
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2 aspects to the solution to this problem that have not been addressed in these answers so far.
One is that the original rolling diameter of the stock tyre size needs to be respected and preserved with regards to braking balance and
suspension.
The other is that the solution to balancing engine rpm vs top speed, if the maximum tyre diameter is observed, is found with modifying the diff
ratio.
If you are concerned about your top speed revs, and, if you think your engine and semi auto trans can handle it, get a taller diff Lee.
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68AutoBug
A.k.a.: Lee Noonan
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| posted on June 30th, 2012 at 12:02 AM |
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| Quote: | Originally
posted by tweety
A good tyre calculator site
http://www.tacomaworld.com/forum/tirecalc.php
When I had my 1916 in Tweety trike with VW type 3 auto I went from 295/50/r15 to 275/60/r15. 8% larger diameter. Really showed up when towing our
camper trailer in that it didnt like hills and got hotter sometimes overheating...and the camper weighed 300 kgms.
Went back to the 295's
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HI
Firsty You went to 295/50-15 which is 4.8% difference from 165/80-15 the standard tyre....
then to 275/60-15 which You say is 8% larger diameter
so if You add those together its 12.8% ?
Lee
that may have been the cause..??
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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68AutoBug
A.k.a.: Lee Noonan
Aircooled Master
Beetle Restorer - Experience over 138% - YIKES --
Posts: 11654
Threads: 449
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| posted on June 30th, 2012 at 12:08 AM |
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| Quote: | Originally
posted by Uber Kafer
2 aspects to the solution to this problem that have not been addressed in these answers so far.
One is that the original rolling diameter of the stock tyre size needs to be respected and preserved with regards to braking balance and
suspension.
The other is that the solution to balancing engine rpm vs top speed, if the maximum tyre diameter is observed, is found with modifying the diff
ratio.
If you are concerned about your top speed revs, and, if you think your engine and semi auto trans can handle it, get a taller diff Lee.
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Most autosticks sold in Australia all had the 4.375 diff ratio
I haven't found a higher one as yet...
so I thought I'd try a larger tyre..
My Son has a couple of 215/80-15 [I think] 484revs klm
so I'll give them a go up a few big hills and see how I go...
165/80-15 are 439 revs a klm
LEE
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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vlad01
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| posted on July 2nd, 2012 at 01:28 PM |
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| Quote: | Originally
posted by 68AutoBug
ALL air cooled VW cars had the top speed as the cruising speed
as most other makes needed an overdrive to acheive this and most didn't have it..
although many English cars did offer this as an option in later years.. MG with overdrive etc..
in the 50's and 60's not many car makers had the cruising speed as the top speed... lol
When You see all those Baja beetles with huge rear wheels and tyres their engines are working much harder
the 1300 & 1500 semi auto beetles had 4.375 to 1 which is the 1200 manual beetle diff size. Later 1600 semi autos had 4.125 to 1 ratio - similar
things happened with manual beetles with the 3.88 to 1 diff ratio instead of 4.125...
VW doesn't say anything about driving at 80 klms an hour everywhere apart from You get better economy..
I don't think it will make any difference, ..
if I go too big a tyre then I'll be in a lower gear revving the engine more going up hills...
LEE
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so you are saying ALL air cooled VWs had a top speed of 110km/h? or we all cruise at 80-90mph? 
71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE |
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