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Mk4 Spitfire tyre sizes


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i tought that but its what comes up from a search

heres another wich does say 4.5 " was introduced but doesnt clarify if the tyre changed 

i dont have a MKiv WSM to dig at the notes 

What are the best tyres for the mk1v Spitfire?
The MK1V (MK4) Spitfire in 1970 moved onto a 4.5” wheel because the wider rim was better suited to a radial tyres. The early MK4 Spitfire offered 5.20-13 Crossply tyres or 145R13 Dunlop SP Sport Aquajet tyres, sadly no longer produced. Again the 145 R 13 PIRELLI CINTURATO ™ CA67 would be our suggestion as the best tyre for the early MK1V Spitty.
 
more blurb
  • The first Triumph Spitfire (MK1, MK11 & MK111) fitted 5.20-13 Dunlop C41 Crossply Tyres with 3.5” wheels.
  • For the MK1, MK2 & MK3 Spitfire we suggest 145 R 13 PIRELLI CINTURATO ™ CA67 as the best tyre for the road.
  • The MK1V (MK4) Spitfire in 1970 moved onto a 4.5” wheel because the wider rim was better suited to a radial tyres.
  • The early MK4 Spitfire offered 5.20-13 Crossply tyres or 145R13 Dunlop SP Sport Aquajet tyres, sadly no longer produced.
  • Again the 145 R 13 PIRELLI CINTURATO ™ CA67 would be our suggestion as the best tyre for the early MK1V Spitty.
  • The ideal inner tube for this is the Michelin 13CG inner tube.
  • The later 1972 production of the MK1V Triumph Spitfire fitted 155 HR 13 Dunlop SP Sport Aquajet as standard.
  • Our suggested tyre in the size 155HR13 Michelin XAS. It is a fabulous tyre on light sports cars.
  • With the extra torque of the 1500 Triumph Spitfire it could carry the longer legs of a taller tyre, we suggest 155 HR 13 Michelin XAS FF.
  • These 155R13 tyres would best fit an Michelin 13D inner tube.
  • Often with these little cars and the accessibility of cheap modern wide tyres people fit wider rims. We don’t recommend that but if you do have wider wheels the best tyre is 175/70 VR 13 PIRELLI CINTURATO ™ CN36.
  • It is worth bearing in mind that a wider more modern tyre carcass will make the effects of this snap oversteer far more dramatic, and far more likely to happen if you push on in the corners in a Spitfire.
  • These tyres would best fit a Michelin 13E inner tube.
  • For a 1300 triumph Spitfire we suggest the correct tyre pressure is 24psi front and 26psi rear. For 1500 Spitfire we would suggest 26psi all round.
 

Pete

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