Bigger wheels also mean more weight to spin up, so worse acceleration. And that your gearing is effectively a little bit taller, so you shift down to 5th on hills a bit more often.
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Yes Guigsy, one of the suppliers mentioned that.Bigger wheels also mean more weight to spin up, so worse acceleration. And that your gearing is effectively a little bit taller, so you shift down to 5th on hills a bit more often.
Hi Silverman.I changed from 215/70/15 to 225/75/16. My speedo now reads exactly the same as the gps.
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Had the falken van 01 on last van and found them very spongy and soft on corners, floaty when passing or being passed. Wouldn’t have them again on a motorhomeGood morning all.
My Ducato 2016, 2.3 speedo reads 70 when the satnav says 65.
Running on 15" rims at the mo with 215/70/15 tyres.
Not a problem as I think I can adjust the overspeed warning.
But it would be good if it was accurate.
Added complication:-
Getting alloys, could stay with 15" and same size Falken 01, which are the tyres I fancy.
Load rating is 109/107, but speedo would still read high.
Other profiles are available but the size that puts speedo correct has poor load ratings, only just good enough.
Would like to go to 16" and 225/75/16 tyres.
Excellent load rating but speedo would read even higher!!!
Other profiles are available but again load rating goes down, although not as bad as 15" versions.
Really did want higher rating as it allows loser pressures to give a softer ride.
Axle weights in full trim are 1610Kg front, 1500Kg back
Can anyone think of any solutions?
Can the speedo be recalibrated and how ?
Have emailed 3 suppliers to for their recommendations.
Waiting for reply.
Am North East based.
Hi Landy.I swapped out my 215 15s for 225 15s. Speedo is now far more accurate, softer ride, and no additional cost as was buying tyres anyway. Although I have a dash mount readout for Speedo so use that.
Hi 1967.HiHad the falken van 01 on last van and found them very spongy and soft on corners, floaty when passing or being passed. Wouldn’t have them again on a motorhome
We have the EUROALL SEASON VAN11 Falkens in 225/70 15 on ours and can’t fault them.Hi 1967.Hi
Think that's the first time I've seen bad press about Falken.
It will shock you then that I now have all season van 11, which I expect are the second revamped from the van 01. These are nowhere near as floaty, they are quiet and smooth. And this vans well heavier than the last oneHi 1967.Hi
Think that's the first time I've seen bad press about Falken.
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No clearance issues at all even when using ramps.Hi Landy.
I
Are the wheel arch clearances OK and no fouling of inner wheel arch panels on full lock each way ?
Might look at the all season. Didn't think of it cos we don't go away in the winter.It will shock you then that I now have all season van 11, which I expect are the second revamped from the van 01. These are nowhere near as floaty, they are quiet and smooth. And this vans well heavier than the last one
Yes you are correct I got it the wrong way round, must have been the extra sun I was sitting inI disagree with that, I think most speedos will read faster than actual speed, they should never read slower
Am favouring 225, good 121 load rating.No clearance issues at all even when using ramps.
Would email Falkin to get recommended pressures based on axle weights.
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Will have a look at those, presumably with hud.I use a GPS speedo. Bang on accuracy, easy to see, and switch to KPH for foreign travel.
Cheap as chips on the usual sites.
Phil
Thanks, can't read the table on the fire 8 I'm on at the mo.Falken-poster-a2_tyre-pressure-c-tyres-english-rz-lowres.pdf
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Speedo information is normally taken from a driveshaft sensor.The rolling radius of the tyres is the only factor that will determine the increase in accuracy for the Speedo. Rolling radius is determined by a combination of width of the tyre, size and profile. Therefore a 225/70/16 will have a different sidewall profile to a 215/70/16 and hence a different rolling radius. Tread depth also determines rolling radius.
Final drive from gearing and differential will also change with different rolling radius tyres.
All manufacturers quote the rolling radius of their tyres if you google it!
Unsprung weight, weight sitting outside of the spring/damping platform (primarily your wheels and tyres), also affects performance, less weight obviously being best, but on heavy and non performance vehicles, is of minor consideration unless you’re substantially increasing the weight.
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I would think so as the same cradle is used for 16” wheels. Personally I’ve still got my old tyre size as the spare. It’s better than a space saver, that some cars have , and if I had a front puncture, and a long drive I would put odd size on the rear (non drive ) axle.A quick query if I may..
I have 4 x 15in alloys currently fitted with 215 70 15's that I wish to fit new 225 70 15 or maybe 225 75 15 tyres to replace the old ones because of the speedo anomily.
I have a 15in steel spare with a 215 70 15 as well, if I fit a 225 75 15 tyre, will it still fit in the standard cradle underneath? (mwb panel van conversion).
Pete
By changing yiu are making tyre 10mm wider so not going to affect the spare carrier i would think. The rolling circumfirence woukd increase though as you are increasing the tyre hieght from the rim. Aprox 10mm here also,A quick query if I may..
I have 4 x 15in alloys currently fitted with 215 70 15's that I wish to fit new 225 70 15 or maybe 225 75 15 tyres to replace the old ones because of the speedo anomily.
I have a 15in steel spare with a 215 70 15 as well, if I fit a 225 75 15 tyre, will it still fit in the standard cradle underneath? (mwb panel van conversion).
Pete
What 225/75 15 tyres are you considering, when I looked the load ratings were lower than the 225/70 15’s.A quick query if I may..
I have 4 x 15in alloys currently fitted with 215 70 15's that I wish to fit new 225 70 15 or maybe 225 75 15 tyres to replace the old ones because of the speedo anomily.
I have a 15in steel spare with a 215 70 15 as well, if I fit a 225 75 15 tyre, will it still fit in the standard cradle underneath? (mwb panel van conversion).
Pete
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Haven't got that far yet but would probably be happy with the 225/70's if they improve the speedo inaccuracy.What 225/75 15 tyres are you considering, when I looked the load ratings were lower than the 225/70 15’s.
I saw a motorhome in France with the 225/75 15’s and they looked quite big in the wheel arch but couldn’t remember the Brand afterwards.
Think most only go to 116 in that size
Which takes rear axle to 2.5tonne.Think most only go to 116 in that size
It's alloys I'm afterIf in no rush, plenty of people swap across to alloys, and sell their 16” wheels if that is the direction you wish to go. I notice the gearing change when swapped from 215 15, to 225 15, so I don’t know if I would now swap to 16” wheels.
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