Jump to content


Photo
- - - - -

Wheels And Tyres


  • Please log in to reply
21 replies to this topic

#1 Ricewind

Ricewind

    Stage One Kit Fitted

  • Noobies
  • PipPipPip
  • 61 posts
  • Location: South Molton Devon

Posted 19 January 2017 - 06:55 PM

I have a car that is potentially capable of 140 mph + and in the past I was able to get VR rated tyres for my 13" rims but after a quick search it looks as if they are no longer available. The car I have has Min sub frame A+ engine suspension etc and I have a choice of 10" alloy  12" steel !3" alloy wheels. Having a light car makes the unsprung weight important, with less sprung weight for the springs to push against the unsprung weight needs to be lower. The 10" wheels are my lightest so choosing these seem a good option with either 145 or 165 tyres. However the 12" rims would be better suited for the overall gear ratio and would look ok without wheel arch mods.

 

My 13" wheels look good but it looks like 175 is the only choice I would have. 145's have an aerodynamic advantage giving better economy and high speed acceleration. The speed rating is based upon temperature range, so 10" wheels would heat up more although the ratings are based upon a heavier load I expect. Stiff side walls are important on the rear tyre as it is a three wheeler with one wheel at the rear. Any advice would be very welcome.



#2 minidaves

minidaves

    Up Into Fourth

  • Traders
  • PipPipPipPipPipPipPipPipPip
  • 4,933 posts
  • Location: kent
  • Local Club: mine

Posted 19 January 2017 - 07:56 PM

yokos in 13's are still v rated. 12" are only h rated along with 10's  the 165's are only h rated



#3 robminibcy

robminibcy

    Camshaft & Stage Two Head

  • Members
  • PipPipPipPipPipPipPipPip
  • 1,516 posts
  • Location: birmingham

Posted 19 January 2017 - 09:14 PM

your car may be able to do 140 but how often does it actually do it? The outside diameter of 10s 12s and 13s if using mini tyres is not that much so the heat generated will be similar. Personally id just go for some fairly sticky tyres given its a wheel down and is presumably lighter than a standard mini.



#4 Ricewind

Ricewind

    Stage One Kit Fitted

  • Noobies
  • PipPipPip
  • 61 posts
  • Location: South Molton Devon

Posted 19 January 2017 - 11:30 PM

yokos in 13's are still v rated. 12" are only h rated along with 10's  the 165's are only h rated

Thanks I have now found 175 50 13 Yokos A359's. These are great for the front. Does anyone know of a non asymmetric (non directional ie symmetrical) v rated tyre  for the back?  



#5 nicklouse

nicklouse

    Moved Into The Garage

  • TMF+ Member
  • PipPipPipPipPipPipPipPipPipPipPip
  • 17,898 posts
  • Location: Not Yorkshire
  • Local Club: Anonyme Miniholiker

Posted 19 January 2017 - 11:41 PM

Do you have limits on the size that you can fit?

#6 nicklouse

nicklouse

    Moved Into The Garage

  • TMF+ Member
  • PipPipPipPipPipPipPipPipPipPipPip
  • 17,898 posts
  • Location: Not Yorkshire
  • Local Club: Anonyme Miniholiker

Posted 19 January 2017 - 11:43 PM

Oh you can also raise the rate by having the tread depth reduced.

A certain little red 1964 mini had the same problem. OK they were going about 100mph faster than you are talking bug they also had true issues.

Read project 64s blog.

#7 Ricewind

Ricewind

    Stage One Kit Fitted

  • Noobies
  • PipPipPip
  • 61 posts
  • Location: South Molton Devon

Posted 20 January 2017 - 12:24 AM

Do you have limits on the size that you can fit?

I'd prefer not to buy a new wheel and mine is a 5.5 j



#8 nicklouse

nicklouse

    Moved Into The Garage

  • TMF+ Member
  • PipPipPipPipPipPipPipPipPipPipPip
  • 17,898 posts
  • Location: Not Yorkshire
  • Local Club: Anonyme Miniholiker

Posted 20 January 2017 - 12:38 AM

Do you have limits on the size that you can fit?

I'd prefer not to buy a new wheel and mine is a 5.5 j

Sorry should have been clearer. Profile. Or diameter if known. I have no knowledge of the rear, if mini trailing arm then there is a max that will fit. If there is no restriction then you have more options.

#9 Ricewind

Ricewind

    Stage One Kit Fitted

  • Noobies
  • PipPipPip
  • 61 posts
  • Location: South Molton Devon

Posted 20 January 2017 - 03:02 PM

 

 

Do you have limits on the size that you can fit?

I'd prefer not to buy a new wheel and mine is a 5.5 j

Sorry should have been clearer. Profile. Or diameter if known. I have no knowledge of the rear, if mini trailing arm then there is a max that will fit. If there is no restriction then you have more options.

 

The rear suspension is the original Berkeley. I am away from car at the momement, so unable to take my stick of inches to it but I know there is a bit of wiggle room to put a wider than 185 if needed, and I suppose if I were to buy a wheel as well, I could go bigger than what is suitable for a 5 1/2 J wheel that I have or even go up a wheel size with an even lower profile tyre as long as the rolling circumference is not too far different to the 174 50 13's on the front. Filling the void a bit more may even have a positive effect on the CD factor and being a low car (when I've finished setting it up) will have a minimal frontal area impact.



#10 Ricewind

Ricewind

    Stage One Kit Fitted

  • Noobies
  • PipPipPip
  • 61 posts
  • Location: South Molton Devon

Posted 20 January 2017 - 03:42 PM

, I could go bigger than what is suitable for a 5 1/2 J wheel that I have or even go up a wheel size with an even lower profile tyre as long as the rolling circumference is not too far different to the 174 50 13's on the front.

 

My last Berkeley had a 185 50 VR 13 on the back. To keep the tyre off of the swinging arm the offset took the centre of the tyre away from the cars centre line by an inch or two. It had no detrimental effect as far as could tell but I may re-engineer the swing arm to bring the tyre into the centre this time, so I need to know what I am going to eventually fit. I have had an asymmetric tyre on the back before at one time, and again I did not notice any adverse effects, but if they are designed to be direction I am guessing it could not have been ideal when cornering in one direction (that is dependent on which way around it is fitted).



#11 GraemeC

GraemeC

    Crazy About Mini's

  • TMF+ Member
  • PipPipPipPipPipPipPipPipPipPip
  • 7,300 posts
  • Location: Carnforth

Posted 20 January 2017 - 04:29 PM

I don't think directional tyres will be a big issue (as long as they're rotating the right way) but assymetric might.



#12 Ricewind

Ricewind

    Stage One Kit Fitted

  • Noobies
  • PipPipPip
  • 61 posts
  • Location: South Molton Devon

Posted 22 January 2017 - 07:00 PM

I don't think directional tyres will be a big issue (as long as they're rotating the right way) but assymetric might.

I meant their cornering direction bias being directional. The rear axil weight is very low most of the time, so that may be a factor that might negate any asymmetry effects of the tyre pattern. Although trikes like this can corner very well, putting a lot of sideway forces into the tyre. Looking at photographs of DIck Buckland's rear tyre on his Buckland B3 when under full cornering limits when racing was an eye opener, it deformed more than I ever imagined possible without failing.  



#13 Ricewind

Ricewind

    Stage One Kit Fitted

  • Noobies
  • PipPipPip
  • 61 posts
  • Location: South Molton Devon

Posted 23 January 2017 - 04:51 PM

Just had some advice from a tyre specialist who said 175 50 13 A359 yoko's would be fine for both the front and single back without any handling or loss of grip issues which is good news :proud: . The only alternative closest match would be 205 60 13 that has 8.7 inch greater rolling circumference.



#14 Northernpower

Northernpower

    Mr. 7-Port

  • Members
  • PipPipPipPipPipPipPipPipPip
  • 2,409 posts
  • Name: Graham
  • Location: North Yorkshire (God's County)
  • Local Club: Its out there somewhere

Posted 23 January 2017 - 07:21 PM

It depends how you are defining loss of handling. I have 175x50 13's on mine and on a flat smooth circuit they're great but out on the road they follow every white line and rut in the road. Driving fast over those surfaces they're a real handful.

#15 Ricewind

Ricewind

    Stage One Kit Fitted

  • Noobies
  • PipPipPip
  • 61 posts
  • Location: South Molton Devon

Posted 26 January 2017 - 04:50 PM



It depends how you are defining loss of handling. I have 175x50 13's on mine and on a flat smooth circuit they're great but out on the road they follow every white line and rut in the road. Driving fast over those surfaces they're a real handful.

 

Thank you Norhernpower although the times that I am likely to need the V rating will be few and far between I think it probably best if they are and so the A 359's seem the best choice all round even for the rear single wheel. I had them on the front of a previouse Berkeley/Mini three wheeler that I used as my daily run. The only time that I noticed any detrimental effect was on the road going out to the Isle of Grain Kent during the construction of the channel tunnel when very heavy loads were transported on the small B road as it was back then. The ruts were quite pronounced. A lot though depends on the scrub angle of your setup, I had Metro Turbo wheels with the inner tyre wall as close as practicable to the shock absorbers. The Hilo's were set so as the upper arm just missed the bump stop so as the bump stop augmented the rising rate. The lowered position induced some noticeable negative camber. Being a three wheeler the back wheel rode between the ruts and was largely unaffected. Although pretty good generally in the wet the only negative thing that I found with these tyres was that they were not so good as the skinnier tyres were, when there was a lot of standing water about.

 

It was unexpectedly hitting deep standing water with the nearside wheel first that finally did for my first Berkeley. The car pulled to the left into a small tree and whether or not the tyres had anything to do with the outcome I cannot say for sure, I am of the opinion that it would of happened with whatever choice of tyre I had because of the depth of water.

 

After-crash_zpsffualnsz.jpg

 

I loved that car, may she rest in pieces (1990 - 2004 and 200,000 miles), I only hope I can get the latest project to work so well.






0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users