AutoArt Jaguar E-type tires

Hi, Chav, Marty

Thank you both for you precise information. 

Chav thank you for your great information and solution, though, I originally was under the false understanding that your 3D-rings where adaptor rings to allow the installation of bigger wheels. 

Re-questionning by Marty allowed me to understand : as him I can claim I now fully understand. Thank you Marty.

That is a smart solution, really.

I may be shy. On my part I am still after a more "traditionnal" solution hoping to find correct size wheels for a direct change. Plus I may be more used to E-Types with black wheels with no white sidewalls.

I will still look at your information closely. 

Regards

Eric B.  

@eric-b 

Eric, I also like the black-wall wheels better for this car, and my original plan was to do a black gap filler. I consider this an acceptable temporary solution, until someone comes up with different one (or CMC makes E-type). The good thing in the 3D-printed solution is it is cheap, and everything is assembled without glue, so it easily comes a part, the bad thing is that stretching the original tire will inevitably damage it and the tire will no longer fit perfectly the original rim shape.

Successfully (so far) trialing another solution, not an easy one but much more universal. Here are several teaser pictures, stay tuned... unfortunately I am working next 7 days so updates will be limited.

Not perfect, the inner diameter of the donor tire was a bit larger, and the difference is visible.

@ Chav

Hello, I will follow your trials with interest and am very impressed by your technique and skills.

Cheers

Eric B.

Helo,

This is just to share some information I gathered around.

I found an interesting information about the same topic (correcting AA Jaguar E-Type wheels) on another diecast forum. The author described his experience and modification he achieved. Interesting is he probably was in the same simple swap tires option I was initially in.

First he confirms the BBR spoke wheels did not work for him. Wheels are a littler bigger then needed (rim and tire - tire outside diameter is 38mm - not far but it is interior size that could be a problem for adaptation on AA rims).

His solution was the AA Charger E49 tires that he bought at autoArtSpares. I must admit that although aspect of the model is improved with these taller tires I was not entirely convinced as I was under the impression 1 or 2 mm were still missing.

Nonetheless I am determined to work this issue on my AA Jaguars and I ordered one E49 chassis from AASpares and received my parcel today. I started by checking sizes and measuring parts (outside tire diameter in mm below).

BBR : 38mm - AA Charger E49 : 35,4 mm - AA E-type : 34,4 mm which seems to confirm the AA E49 wheels may be a bit small.  Reminder : Chav/Marty agreed sought after size would be 37 mm

E49 wheels ar a bit taller (not quite enough), wider (may not be a problem than the E-Type originals. On the plus side for installation they are soft hollow types, not the solid type stiff wheels. 

Eric B.

@eric-b 

I actually calculated the size of the tires in 1:18, here is how ... and correct me if I am wrong

This is a picture of the wheel of E-type that I took in 2021, assuming the tire size is period correct.

The tire size is 185VR15

Rim diameter is 15'' = 381 mm  /18  =     21.17 mm 

Tire width is 7.28''  =  184 mm  /18   =    10.2 mm

Tire diameter is 26.65'' = 677mm  /18 =   37.6 mm

Marty said Kyosho's wheels are 37 mm

I achieved 37.2 mm with my "whitewall" fix and 37 mm with the Paragon Daimler tires.

The BBR wheels seems OK size-wise at 38 mm

Hi Chav, 

Thank you for your additionnal information. 

I am entirely with you with your research and I agree with you 37 to 38mm is a size range is OK - At 37.6 mm Type E wheel scale size is just in the middle of the interval. 

If we think radius not diameter it is a matter of about 0,2 mm (correct me if I am wrong 0.01 in). 

My will is just to collect and share as much information as possible here. 

I have the BBR Ref. P01 set. I was wondering what was the difference with other BBR wheel sets.

P01 seems to be the closest we may need (4 wheels are same size - P03 comme with same front wheels but rear wheels are larger).

P01 sizes are Outer diameter 38mm (OK) - Tire height 7.5mm - Inner diameter (= rim diameter) 23 mm which is where the problem may be - Your calculations give 21.17 mm scale size. I'll try to measure the Auto Art rim size for a confirmation. 

Eric B.    

@eric-b 

I was not familiar with the BBR P01 set ... just looked at online pictures. The rims are Borrani pattern. I am not expert on rims, but the Jaguar wheels pattern is very different. So supposedly we figure how to swap the wheels safely, we'll change one inaccuracy for another. If you only swap the tires, they will still need modifications similar to my Paragon tire fix.

I think my next fix will be to make custom polyurethane wheels based on the original Autoart wheels ... that will take some time, I have never done polyurethane casting.

Hi Chav

I am not expert on rims either and my hope was to be able to borrow the BBR tires to set them on the AA rims. I am not sure locking the BBR on the AA axles would work (i stii want my wheels to spin in the end). My will is keep the AA rims at all cost. 

My surprise is AA E-Type rims seem to be larger than I though. I measured them at 23.9 mm diameter with a vernier caliper.

This is not a contact measurement but a tengency measurement as wheel was still installed on the model E-type, tire in position on rim. Therefore I maybe some tenth of a millimeter off but AA rims seem to be larger than what I thought and may come closer to the BBR tires size.

I'll try again to confirm measured size but this raises a question : in the end could not the BBR tires be a solution. I am prudent about this and I don't claim success 😉 - I know others have tried before included people who are much more knowledgeable and skillfull than I am. 

Another problem is BBR tires are the stiff type and I don't think it is possible to make a swap of tires with wheels mounted on model.

Eric B. 

PS : I am still impressed how your trial with the white wall bigger wheels improves the look or your model. In the end this really is a matter of tire size. You and Franklemire really proved the point. 

@eric-b 

besides low flexibility, the other problem with BBR tires will be that the tire-well is too shallow to fit AA rim and needs modification, it needs to be at least 3.2 mm deep.

If this blueprint is accurate, the well has to be deepened by at least 2 mm

Because of the stiff tire, the material could be cut of like this:

in which case, there will be large gap on the inner side of the tire, but mounting will not be a problem

@ Chav

Again, that is very clear and very precise. Now I can figure out the whole problem with even an understanding of what the AA wheels inner profile is. I guess we also have all the data for the AA E-type wheel. You are several steps ahead of my understanding.

Also your sketches are very clear.   

Thank you very much for all that sharing accurate information. 

Eric B.