smart51
|
| posted on 9/6/10 at 06:02 PM |
|
|
spare saver wheels - how fast?
I'm making an eco 3 wheeler and I'm looking for some narrow wheels. I reckon 135s are plenty because at 200 - 220kg they must be about
the same as 275s on a 440kg car. I've suddenly spotted that my donor car comes with 135s on their space saver spare rims. The T speed rating
is more that my 3 wheeler's top speed so is there any reason I can't use them as my normal front tyres?
|
|
|
|
|
SteveWalker
|
| posted on 9/6/10 at 06:07 PM |
|
|
Space savers are normally limited to 50mph, but that is probably to do with them being an odd wheel on the car.
Citroen AXs have 145s I think for another option.
|
|
|
minitici
|
| posted on 9/6/10 at 06:19 PM |
|
|
Most spacesaver tyres also run a silly high pressures.
|
|
|
Gordy
|
| posted on 9/6/10 at 07:02 PM |
|
|
Done 115mph in audi coupe quattro with space saver fitted  when i was young+silly! think the speed rating is low more because it grip level is poor
when fitted to a heavy tin top and law suites.
|
|
|
indykid
|
| posted on 9/6/10 at 07:24 PM |
|
|
the T speed rating states that the tyre will be happy running up to 118 mph.
i'd imagine the available compounds would be pretty average though
tom
|
|
|
whitestu
|
| posted on 9/6/10 at 08:35 PM |
|
|
2CV wheels?
|
|
|
Dingz
|
| posted on 9/6/10 at 10:27 PM |
|
|
2nd 2CV 125 or 135 x 15 tyres
Phoned the local ramblers club today, but the bloke who answered just
went on and on.
|
|
|
smart51
|
| posted on 10/6/10 at 07:01 AM |
|
|
2CV wheels are a 3 stud fitting meaning you have to have 3 stud hubs. I want to use the hubs and uprights from my donor.
I was planning to use stock 145/70 13 wheels and tyres until I heard about the "sporting" space saver spare.
|
|
|
bmseven
|
| posted on 10/6/10 at 07:32 AM |
|
|
quote:
Originally posted by minitici
Most spacesaver tyres also run a silly high pressures.
Agreed - The ride might be a bit harsh as all I have seen run at typically 60psi
[Edited on 10/6/10 by bmseven]
BMW 7 Resource
Bures Pit anyone?
|
|
|
smart51
|
| posted on 10/6/10 at 08:16 AM |
|
|
The pressure is an interesting point and I've been thinking about it. Perhaps that is for heavy cars. A 135/70 tyre might have a contact patch
of 130mm x 50 mm which is about 10 square inches. At 60 PSI the tyre can support 600 lbs or 272 kg which is a 1089 kg car assuming equal corner
weights.
My trike will be about 300kg laden with about 55% over the front axle. 85.2 kg per wheel is 182 lbs or 18.2 PSI. That's not to say that the
tyres rely on high pressure to hold up the side wall. The tyres on the donor's spare wheel are marked 44 PSI max which is about the same as
normal tyres. I suspect I may be OK on the pressure front.
|
|
|
Liam
|
| posted on 10/6/10 at 09:01 AM |
|
|
They only run such high pressures on a tintop as they are so narrow and high profile, and are temporarily doing the job of a much lower profile tyre
almost twice as wide on a heavy car. You'll be fine on a light vehicle but you still might find it needs unintuitively high pressure due to the
high profile. Like road bike tyres which also run high pressures.
|
|
|
iank
|
| posted on 10/6/10 at 09:12 AM |
|
|
You can buy 135/80-13 or 135/70-13 tyres with no real problems, though mostly budget brands.
Do a search on http://www.mytyres.co.uk or http://www.camskill.co.uk
I think the speed restriction on spacesavers is to do with the silly pressures which are required to support a car full of people and luggage on such
a narrow/large sidewall tyre. Pressuring down for a 200kg car shouldn't be a problem though how low you can go may depend on the sidewall
construction.
The style of the steel wheels may look better on a retro style design though I can't recall seeing the spacesavers on a cinq.
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
|
|
|
