Tyre upgrade
Hi I read in one of the discussions that I can fit slightly wider tyres this will help with pay load,could someone comment on this please. I have a neismann bischoff alto on a fiat chassis.
The tyres at moment are 215 70 15 what could I go up to thanks
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I have the General Grabber AT2’s that are wide & heavy rubber so less bulge. Check these in your size if they have them-
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increasing the width to 265 from 215 will mean you'd have to reduce the aspect ratio to more like 55% otherwise the speedo will be way out.
https://www.tyremen.co.uk/tyre-size-calculator
but surely the payload is the payload what ever tyres are fitted .... 🤷♂️
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Hi Norman ,I’m afraid your options on 15” tyres are very limited,what is the load rating on your tyres ,I suspect the load rating on most of the 15” commercial tyres is the same so even if you did manage to find another alternative you wouldn’t gain any benefit.When I get into work tomorrow I will have a look and get back to you..But my advice to you is stay o that size . Thinking about it you could possibly go to 225/70R15 but I will check tomorrow if the load rating is greater and there would be a benefit to you.But be aware that even if the load rating was slightly higher it would not permit you to carry more weight.
Ref.Rocky2 comment , the General AT2 is a 4x4 tyre and is no way suitable for your Vechicle, he is talking about a towcar and your Vechicle is a Motorhome .
Brian & Jo
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BJ-I have an Isuzu DMax(4x4) pick up, my comment was what I(me) has not what N16 should get👍🏻. I can well understand now why a lot of folk refuse to offer help, there are way too many nit pickers🤷🏻♂️☹️
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Wow I’m not even going to respond to that
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Brian & Jo know what they are talking about! You could also look to SV Tech because they will know what your chassis can take.
I uprated my Hymer 504 through SV Tech to 3850kg without changing tyres but the axle plates remained at 2000kg front and rear. I had Goldschmitt semi air suspension on the rear.
Hymer advised me that my alloy wheels would not take 225/70R15 tyres and I would need to replace the wheels. New wheels would still only mean a max of 3,850kg but the rear axle would be greater than 2000kg.
Of course, if you go above 3,500 kg max, you need a C1 licence entitlement, you have to inform the DVSA so your 'log book' is updated and have a new plate attached to the vehicle (SV Tech help you sort out both these), and inform your insurers (my premiums did not go up).
Was it worth it? Not really. It ensured I did not break the law by about 100kgs when I was carrying two batteries, a full water tank, and/or second passenger. We did this for a couple of years but now we are back to using sites, one passenger, 30l of water when travelling, and thus under 3,500kg. I will down plate before I reach 70.
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How does that help the original poster if they are not suitable for motorhomes? It's surely not nit picking to point that out?
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I put in a caveat to N16 there was no need to include me in BJ’s post.
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If you talk to Sv Tech (SvTech) they will advise at no charge. If you then wish to up rate they will provide the necessary documentation / plate for which they do charge.
As an aside you can nominally increase the payload by changing the tyres to a higher load rated tyre but you don't often gain much.
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Generally the cumulative load rating of the tyres is greater than the MTPLM of the vehicle so changing the tyres often merely provides a more comfortable ride or possibly a greater margin of safety.
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Surprising not really that difficult. I wanted to up plate from 4.25t to 4.5t. The van had already been fitted with air suspension and a plate showing 4.5t added.
I spoke to SvTech and they advised. To go to 4.5t just fill out the form included in the V5C, send it and a covering letter and photos of the plates to the DVLA and the V5C will be amended. DVLA advised the same and the job was done. A simple paperwork exercise.
Had I wanted to I could have paid SvTech for a further plate taking the van to 4.7t and they would have dealt with the DVLA on my behalf. No additional physical changes to the van would have been needed.
Had I uprated the tyres from load rating 116 to 120 I could have up plated to 4.8t. Again SvTech would have done all the paperwork but I would have had to provide them with photo evidence of the tyre change.
In each case the chassis and axle limits allowed the change.
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Wider tyres have no effect on load rating. If you post the load rating for your current tyre then you can search for higher load rated tyres. Without knowing the current load rating or the axle loads it is not possible to determine what is suitable.
From the info you have give there is probably a higher load rated tyre that is suitable that is slightly wider but lower aspect ration.
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Out of interest, who is the manufacturer named on the revised plate that SvTech issued? Unless the original manufacturer covered the uprated weight by an appropriate amendment in his type approval documentation he can no longer carry any product liability so presumably SvTech is then responsible and is then the named manufacturer. Is that so?
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In theory, you could fit 225/65R15 which are 8mm smaller diameter or 235/65R15 which are 4mm larger in diameter, subject to being suitable for the width of the rim. But a quick look they don't seem to be available in commercial rated tyre, so it looks like what you have got is the main option.
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I did not use SvTech other than to discuss the process with them and to gain initial advice. The photos of the three plates I sent to DVLA were in order of their fitting:
1. Fiat (base chassis)
2. Alko (mod chassis)
3. VB (VB 4C air suspension)
I achieved what I wanted at minimal cost, a little of my time, an email, two phone calls and a postage stamp. I did not delve any deeper.
I believe SvTech is licenced, presumably by DVLA, to issue plates. I expect it is on their website.
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But neither Fiat, nor AlKo nor VB are the vehicle manufacturer and it is the vehicle manufacturer that has to have the completed vehicle type approved and to apply the final and valid plate.
Fiat, AlKo and VB are only Stage 1 manufacturers.
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