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Discussion Starter · #1 ·
How do you correctly measure the tire sizes needed?

Example: Big number is tire daimeter? Second number is
tire width?

Meaning old 1980's Scalex F1 tires are 30mm x 14 mm?

How about old Triang stuff? 38mm x 5mm, these are the
ones I really need!

HELP!

ncng
 

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Rich Dumas
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3,533 Posts
It is actually more complicated than that. 1/32nd slot cars usually have wheels with a center ridge and the width and diameter of that is as important as the width and diameter of the body of the wheel. O.E.M. replacement tires for fairly new cars are often difficult to find, let alone tires for older cars. The makers of silicone and urethane tires have fitment charts that are helpful. Slot Car Corner, for example has fitment charts for the Supertires that they sell. There are also some tire makers out there that use the original tire to make the molds for their tires, rather than having dedicated molds machined from scratch. Makers that use this technique can offer a much greater variety of tires, hovever they are not as likely to be perfectly round. Ortmann would be an example of that type of replacement tire.
 

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Prof I T
Ting Tong
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11,085 Posts
hi
i have just found out how many variations oh different wheels there are when it ccomes to car's from the same maker..

The scalextric one's i have measured have had raised centre sections measuring from 3.2mm upto 6.5mm,with a 3.6 thrown in as well. These are from cars from there lmp range..

I just invested in a digital vernier from aldi for measuring accurately as i am building routed layout and so far it has proved invaluable. Came in under a tenner as well...
 

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Discussion Starter · #4 ·
These are the tires i need,

> Tires I need: straight grove treaded, diameter 27/28mm, inter wheel
> diameter 20-22mm, tread width 4mm, tire width 7mm,

Thoughts?

ncng
 

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Go here and type in the Scalextric car C number Tires
 

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OK well I am at a loss here with measuring wheels... have read these pages multiple times and it still does not make sense to me.

When measuring the wheels, do you look at them from the top or from the side to work what is the step, rim etc. Why can't this stuff be easier explained and shown better in images than it currently is.

I am after tyres to suit C4033 Ginetta G60-LT-P1 LeMans 2018 Blue #5

Thanks

Johnno
 

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Alan Wilkinson
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1,032 Posts
Johnno,
I totally agree with you about the tyre sizing nightmare.
It seems that all manufacturers make it difficult and obscure
The worst is that many quote fitted outer tyre diameters without stating the wheel size this relates to.

measure and post here in the thread:
1. Wheel diameter (the face of the wheel that shows)
2. Bead /rib diameter (the full diameter including the bead that sits inside the tyre)
3. Wheel width
4. Rib width (the raised bead that sits inside the tyre)

..and add
5. The final size you want the fitted tyre to be

You might have a chance of someone helping you out here
Alan
 

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For sure it would be great if there was a universal standard for measuring tyres that all the makers stuck to or a reasonably complete guide to what tyres fit what sort of wheel. Unfortunately there isn't!.

Some suppliers of replacement tyres do have some helpful info, RS is a good example http://www.rsslotracing.com/tyres_modernRacing.htm but of course suppliers cannot be expected to give details of their competitor's products.
 

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Rich Dumas
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3,533 Posts
Aftermarket aluminum wheels tend to be more or less standardized, so finding tires to fit them is much easier. The sort of plastic wheels that come on most 1/32nd cars are more of a problem because they are usually not standardize even for the same make. In the last couple of years or so at least a couple of makers, Pioneer and Scalextric, have moved to standardized wheels. Most aftermarket tire makers now use CNC machined molds to make their tires and those are expensive. Because most wheels have a center ridge the molds need to have two parts that register perfectly. The maker would have to sell a considerable number of tires just to cover the cost of a mold, so the maker needs to make a guess as to the popularity of a particular car to avoid being stuck with useless molds.

The individual tire makers usually have tables that show what tires match the various wheels. A more sophisticated approach was taken by Slot Car Corner for the Quickslicks silicone and Paul Gage urethane tires. There are interactive guides on the site for both makes so you do not have to scan an entire large table to find what you want.

Ten years ago some kind person made an Excel spreadsheet available that listed tires for many cars. Rubber, silicone and urethane tires were included. I am not aware if an updated version of the spreadsheet is available, but if someone wanted a copy of the old one they could drop me a PM with their e-mail address.
 

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There are six measurements required for tyres, the attached image shows you what these are. Using a digital Vernier Caliper you can make this job easier. Once you have these, contact the MJK retailer and give them these measurements.

A = Overall tyre diameter on rim in mm
B = Overall tyre width on rim in mm
C = Rim diameter
D = Rim width
E = Overall Rim diameter
F = Step width

attachicon.gif
MrSlotcar MJK Tyre How to Measure.jpg
This is not correct. I'll try to correct the letters based on the Picture:

A = E Overall Rim Diameter

B = C Rim Diameter

C = F Step Width

D is correct

E = A Overall Tire Diameter on Rim in mm

F = B Overall Tire Width on Rim in mm
 

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Electric model car driver
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OK well I am at a loss here with measuring wheels... have read these pages multiple times and it still does not make sense to me.

When measuring the wheels, do you look at them from the top or from the side to work what is the step, rim etc. Why can't this stuff be easier explained and shown better in images than it currently is.

I am after tyres to suit C4033 Ginetta G60-LT-P1 LeMans 2018 Blue #5

Thanks

Johnno
The Ginetta should have standardized hubs and if the centre ridge is 5mm +or- a gnats tit wide they will be, in which case NSR or Slot.it tyres will fit. And pretty much all you need to know is the diameter and width to get correctly sized tyres from these manufacturers that'll fit. However the type of track you are running on and if you use magnets or not might need consideration too.
 

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I'm currently having real issues finding tyres to fit two carrera models (BMW M1 procar & Zakspeed Capri). The originals have completely perished (they have gone like toasted marshmallows - crusty on the outside, soft inside). Main issue with the carrera wheels is that the ridge is very wide... Using the picture above, I'm looking at this:

Carrera BMW M1:

A - 17mm

B - 14mm

C - 8mm

D - 11mm

E - 19.5mm

F - 11mm

Carrera Zakspeed Capri:

A - 19.5mm

B - 16mm

C - 8mm

D - 11.5mm

E - 22mm

F - 12mm

Couple of NSR options look like they come close, but it doesn't state the rim ridge/step measurements on them so don't know if they'll fit over the wide carrera ridges.

Can anyone recommend anything?
 

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What I'm finding on my old Carrera and Fly cars is the wheels end up spinning on the axles and I'm forced to buy new aluminum wheels of the same size. I'm much more in tune now that I know I can buy sets of wheels and tires rather than try and find the needle in the haystack OEM size tire.

AdeC - you might want to go the same route and just replace the OEM wheels with better aluminum ones.
 

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Premium Member
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538 Posts
I'm currently having real issues finding tyres to fit two carrera models (BMW M1 procar & Zakspeed Capri). The originals have completely perished (they have gone like toasted marshmallows - crusty on the outside, soft inside). Main issue with the carrera wheels is that the ridge is very wide... Using the picture above, I'm looking at this:

Carrera BMW M1:

A - 17mm

B - 14mm

C - 8mm

D - 11mm

E - 19.5mm

F - 11mm

Carrera Zakspeed Capri:

A - 19.5mm

B - 16mm

C - 8mm

D - 11.5mm

E - 22mm

F - 12mm

Couple of NSR options look like they come close, but it doesn't state the rim ridge/step measurements on them so don't know if they'll fit over the wide carrera ridges.

Can anyone recommend anything?
Carrera Slots have the BMW ones in stock (2 fronts and 2 rears in the set), but not the Capri ones at the moment...I had the same problem with one of my Zakspeed Capri's and bought a couple of sets from them just in case the others went the same way. Paul Gage makes rears for the Capri and they have those in stock...but not fronts by the look of it

https://www.carreraslots.com/slot-cars/EVCT.html
 
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