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Frequently Asked Questions

 

ALL SPECIAL OFFERS OR DISCOUNTS ARE MUTUALLY EXCLUSIVE - A CUSTOMER CANNOT APPLY MORE THAN ONE DISCOUNT OR OFFER TO AN ORDER. FOR GIVEAWAY OFFERS, THE OFFER APPLIES TO THE FIRST ORDER PLACED DURING THE OFFER PERIOD ONLY.

How can I convert my tyre pressures from bars to psi?
From bars to psi multiply by 14.5034. From psi to bars multiply by .06895 (or divide by 14.5034)

How do I calculate the revolutions per mile of my tyres?
To obtain the true figure you should take the deflection into account and start with the diameter (in inches) less tread height. Therefore the calculation should be; tyre diameter (less 2x tread depth), multiplied by 3.142 to get the circumference, you should then divide 63360 (which is the number of inches per mile) by the circumference to obtain the revolutions per mile.

Why can't I run my Beaded Edge tyres at a lower pressure for a more comfortable ride?
Beaded edge tyres are "inflation held" unlike more modern tyres, they stay on the rim by air pressure alone. Reducing the pressure could allow the tyre to "jump off" the rim or lead to rapid tyre failure as the tyre chafes against the rim.

Why do my crossply tyres develop "flatspots" when I leave my car parked for a few days?
As the vehicle travels along, the tyres rotate and flex. This action generates heat within the casing of the tyre as the cords move. When the vehicle stops the weight of the car presses down in one place and the tyre's cool down, this can sometimes cause the tyre to "set" or develop a temporary flat spot. During the next drive the tyre warms up again and the process is repeated. To stop or significantly reduce this cycle, raise the tyre pressures by 2 or 3 psi this reduces the flexing and therefore reduces the heat generated.

My car has wire wheels but I can't find tube type tyres, so can I put tubes in my tubeless tyres?
Most manufacturers accept that it is safe to fit tubes in tubeless tyres providing the correct size tube is used.

Can you offer guidance on the use of tubes in tubeless road tyres?
When tubes are fitted, it is important for the user to understand the potential drawbacks. When a tube is fitted to any tyre, it is important that the inside of the tyre is carefully examined to ensure that there is no feature which could cause premature tube failure due to cuts or chafing.  Such examples are:-

The following points should be noted:

Inner tubes should also be used:

My crossply tyres have several size markings on them, why is this?
Some crossply tyres are dual marked, for example 475/500-19, this means that the tyre will replace both a 475-19 and a 500-19. It is therefore a compromise between the two.

Why can't I use treaded racing tyres on my road car?
There are several reasons why this is not advisable, racing tyres are built without compromise; they are generally a softer rubber so may not last long and could overheat, they have reduced wall and crown thickness to reduce weight and could be easily damaged. Racing tyres are also moulded with reduced tread depth offering limited water clearance.

Can I mix radial and crossply tyres on my car?
For the best performance keep the same construction of tyre on front and rear but yes, you can mix the two. By law you have to fit crossply on the front and radial on the back.

Is it possible to fit modern radials on my 60's classic car?
In some cases you can replace crossply tyres with radials - but it is not always the best option and the tyre should be selected carefully - contact us for advice.

I am fitting radials in place of crossply tyres on my car - should I keep the tyre pressure the same?
No -when fitting radial tyres in place of crossplys it is normally important to increase the tyre pressure due to the difference in construction.  The difference in pressure can vary, so it is very important you contact us for advice when changing to radial tyres.

One of my beaded edge tyres recently came off the rim and I noticed it was quite rusty inside, are they safe?
The shape of the rim shares a high level of importance with the pressure, the nose at the tip of the clinch intrudes into the tyre forming a positive lock. However if this area is allowed to develop a sharp corroded edge it will rapidly cut the tyre bead. It is also common practice amongst restorers to cut this area back to provide a more sympathetic surface. This is a mistake and will lead to premature failure as it drastically reduces the support in this area.

My car is fitted with new beaded edge tyres but both front tyres have bulges on the sides, is this fault with the tyre?
From your description I suspect that the heel of the tyre has actually torn, leaving the side wall unsupported resulting in a side wall bulge. This is commonly caused by one of two reasons, the first and most common is under inflation, this allows the tyre to flex on the rim which in turn allows the nose of the rim to chafe and eventually cut through the toe. The second reason is poor rim condition, over the years it has become common practice to "cut back" or "tidy up" the nose on the rim edge to remove the sharp corroded edge, this is not good practice as it leaves the heel of the tyre unsupported when under load causing the rim to "skin off" the tyre heel.

Beaded Edge Tyres

Steps to replacing a Car TyreI need to replace a tyre on my car but I can't find a local garage that can help, the tyres are 820x120 beaded edge.
I can understand tyre dealers and garages expressing concern as they are quite different from modern tyres. However, with a little advice and care it is possible to fit them yourself. Firstly with the tyre removed check the rim for condition if necessary we can provide a copy of the rim profile, check for crushed clinches, sharp and corroded edges etc.

  1. Slightly inflate the tube and with some French chalk fit the tube inside the tyre.
  2. Offer the tyre to the rim and put the valve in the valve hole.
  3. With a beaded edge tyre lever, lever on the inside bead first, taking care to avoid pinching the tube, beaded edge tyres are like giant elastic bands so expect some resistance!
  4. When your satisfied that the first side is on correctly, work around the rim with the lever, you will find it easier with two levers at this point, one to hold the beginning in place and one to work around.
  5. With the tyre fitted rotate the tyre while bouncing on the ground to ensure the heels fit into the clinches correctly, when your satisfied that the tyre is fitted correctly inflate the tyre to 5psi, stop and check correct heel fitment and inflate to correct pressure.

Beaded edge lever have hooks at one end to avoid" tube nipping".

What are the approximate rim dimensions for beaded edge tyres?
The chart below gives approximate dimensions for the rims designed for beaded edge tyres.  The size and condition of your rims is of the utmost importance when using this tyre design - please contact us with any questions.

vintage tyres classic tyres beaded edge tyres rim wheel

RIM SIZEWIDTH AWIDTH BCIRCUMFERENCE DDIAMETER D
24x2 35mm 1.3/8" 47mm 1.7/8" 1628.8mm 64.1/8" 518mm
24x2.25 35mm 1.3/8" 47mm 1.7/8" 1577mm 62.1/8" 502mm
26x2 35mm 1.3/8" 47mm 1.7/8" 1811.4mm 71.5/16" 576.5mm
26x2.25 38mm 1.1/2" 51mm 2" 1810mm 71.9/32" 576mm
26x2.5 35mm 1.3/8" 47mm 1.7/8" 1692.3mm 66.5/8" 539mm
26x3 42mm 1.11/16" 55mm 2.3/16" 1610mm 63.3/8" 512mm
650x65 38mm 1.1/2" 52.5mm 2.1/16" 1600mm 62.7/8" 509mm
700x80 45mm 1.3/4" 61.25mm 2.3/8" 1610mm 63.3/8" 512mm
28x2 35mm 1.3/8" 47mm 1.7/8"
28x3 42mm 1.11/16" 55mm 2.3/16" 1755mm 69.1/8" 559mm
30x3.5 51mm 2" 68mm 2.11/16" 1835mm 584mm
710x90 51mm 2" 68mm 2.11/16" 1618mm 515mm
715x115 62mm 2.7/16" 82mm 3.1/4" 1414mm 450mm
730x130 62mm 2.7/16" 82mm 3.1/4" 1414mm 450mm
760x90 51mm 2" 68mm 2.11/16" 1759mm 560mm
810x90 51mm 2" 68mm 2.11/16" 1932mm 615mm
815x105 62mm 2.7/16" 82mm 3.1/4" 1926mm 613mm
875x105 62mm 2,7/16" 82mm 3.1/4" 2118mm 674mm
820x120 67mm 2.5/8" 90mm 3.9/16" 1778mm 566mm
880x120 67mm 2.5/8" 90mm 3.9/16" 1979mm 630mm
895x135 77mm 3" 100mm 3.15/16" 1854mm 590mm

IMPORTANT
This information has been gathered from many different sources and should be considered an approximation

What are the equivalent sizes for my tyres?
Tyres are not always interchangeable because of differences in load ratings, tyre dimensions, wheel well clearance and rim sizes.  Before ordering or fitting any tyre size other than specified for your car, please contact Vintage Tyres - our experienced staff will be able to advise suitability.  The chart below is a guide to help tyre size conversion.

CROSSPLY 
<1964
  
1965<
BIAS BELT 
60% Ratio
 
70% Ratio
 
78% Ratio
RADIAL 
70% Ratio
 
80% Ratio

520-10

 

 

 

 

165/70R10

145R10

520-12

 

 

 

 

165/70R12

145R12

550-12

 

 

 

 

175/70R15

155R12

560-12

 

 

 

 

175/70R12

155R12

520-13

 

 

 

 

165/70R13

145R13

560-13

 

 

 

 

175/70R13

155R13

590-13

 

 

 

 

185/70R13

165R13

600-13

645-13

 

A70-13

A78-13

185/70R13

165R13

640-13

650-13

 

 

B78-13

 

175R13

670-13

 

 

 

C78-13

205/70R13

185R13

700-13

725-13

 

D70-13

 

205/70R13

185R13

520-14

 

 

 

 

 

145R14

560-14

 

 

 

 

175/70R14

155R14

590-14

 

 

 

 

185/70R14

165R14

600-14

645-14

 

 

B78-14

185/70R14

165R14

650-14

695-14

 

 

C78-14

195/70R14

175R14

 

 

 

D70-14

D78-14

200/70R14

185R14

700-14

735-14

 

E70-14

E78-14

205/70R14

185R14

750-14

775-14

F60-14

F70-14

F78-14

215/70R14

195R14

800-14

825-14

G60-14

G70-14

G78-14

225/70R14

205R14

850-14

855-14

H60-14

H70-14

H78-14

235/70R14

215R14

900-14

885-14

J60-14

J70-14

J78-14

245/70R14

225R14

950-14

 

 

 

 

 

 

500-15

 

 

 

 

 

145R15

560-15

 

 

 

 

175/70R15

155R15

590-15

 

 

 

 

185/70R15

165R15

600-15

 

 

 

 

185/70R15

165R15

640-15

 

 

 

 

205/70R15

185R15

650-15

685-15

 

C70-15

C78-15

195/70R15

185R15

 

 

 

D70-15

D78-15

200/70R15

185R15

 

735-15

E60-15

E70-15

E78-15

205/70R15

185R15

670-15

775-15

F60-15

F70-15

F78-15

215/70R15

195R15

710-15

815-15

825-15

G60-15

G70-15

G78-15

225/70R15

205R15

760-15

845-15

855-15

H60-15

H70-15

H78-15

235/70R15

215R15

800-15

885-15

J60-15

J70-15

J78-15

245/70R15

225R15

820-15

900-15

 

K70-15

 

 

 

 

915.15

L60-15

L70-15

L78-15

 

235R15

*Please note, when replacing crossply tyres with radials the tyre pressure required is often higher, please contact us for advice.

What tyres should I fit to my Jaguar XK120, XK140 or XK150?
We have compiled the answer here: Jaguar XK Fitments.

What tyres should I fit to my Jaguar E-type?
We have compiled the answer here: Jaguar E-type Fitments