Technical Why does the 4x4 have a 4.11 % biger tire size. ???

[The Pretender]

Normal Panda has 185/55R15" tire size, the 4x4 (Trekking) has 175/65R15" tire size. ???

Why is that so much bigger. ?

 

[Blue2U]

Unless the 4x4 tires are all weather as well as being a slightly different size, I'd guess for looks.

 

[Andy Monty]

Narrower tyres cut down and find grip higher profile gives better cushioning

 

[Caravadossi]

The 500 Trekking sits higher & has Goodyear Vector AS tyres – presumably as does the Panda(?)

191622Z

 

[babbo_umbro]

The 4x4 has mud and snow tyres as standard.

 

[deeyup]

Most prob due to what's made in mud and snow pattern in a 15"
I do see though that the cross is going to have 185 width

 

[4x4Panda]

The 4x4 has mud and snow tyres as standard.

hi - I thought they were full winters?

 

[Goudrons]

The 175/65's will lift the ride height by 12mm over the 185/55's.

It's one way Fiat have increased the ride, along with jacking the suspension.

Taller tyres tend to cope with the rough stuff better than lower profiles, as mentioned they cushion better and protect the rims from smacking the deck.

 

[babbo_umbro]

hi - I thought they were full winters?

No - M+S - they seem to be quite a reasonable compromise, including motorway/autoroute/autostrada cruising at 80+,

 

[deeyup]

No - M+S - they seem to be quite a reasonable compromise, including motorway/autoroute/autostrada cruising at 80+,

You're both right, they are winter tyres, but mud and snow rated.

 

[The Pretender]

But does that not mean they have to adjust the gearing or speedo to get the right speed projected on the dial. ???

 

[Moultoneer]

But does that not mean they have to adjust the gearing or speedo to get the right speed projected on the dial. ???

All the instruments are electronically driven, so it's a fimware adjustment.

Despite that, my Trekking's speedo reads about 8% fast, according to
my Garmin GPS (which is within the allowable legal tolerance)



Chris

 

[The Pretender]

All the instruments are electronically driven, so it's a fimware adjustment.

Despite that, my Trekking's speedo reads about 8% fast, according to
my Garmin GPS (which is within the allowable legal tolerance)



Chris

That would mean you can even run bigger tires, "Rolling Circumference Wise" then 175/65R17".

 

[Herts Hillhopper]

To the question about the speedo: do the maths with any tyres size. When new it has 8mm of tread, when illegal it has 1.6mm - a difference of 6.4mm. So between a new and a worn out tyre the diameter changes by 12.8mm total. This may be one reason why you seem to get better economy when you fit new tyres, since the speedo/mileometer cannot compensate for the 'bigger' new tyres.

For info, My 4x4 MJ is, according to sat nav, not doing 70mph until speedo shows 78? (And at speedo-indicated 70, is doing 2700rpm if anyone's interested

 

[The Pretender]

For info, My 4x4 MJ is, according to sat nav, not doing 70mph until speedo shows 78? (And at speedo-indicated 70, is doing 2700rpm if anyone's interested

THX for that.

 

[Aikidoamigo]

That'll be just for show on the cross, no real need for the extra width

Narrow tyres standing tall is better for off road conditions.

Remember those old series 1 landy's their tyres were also super slim

 

[R1NGA]

Most production speedos over-read by typically 6-8%, deliberately, to help stop people speeding. Fitting the 185/65's instead of the 175/65's will probably make the speedo spot-on in fact. I went from a 225/75 to a 245/75 on my old Land Rover and the speedo become 100% accurate according to GPS.

I will possibly look to replace the tyres on mine, come the time, with the 185's as fitted to the Cross.

 

[triumph7]

That's a good idea to gain a little extra clearance.....

 

[The Pretender]

Does anybody know how wide the Cross wheels are, 6.0x15" or 6.5x15". ???
And is the Offset/ET still 35. ???