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Post by suffolkrover on Jul 20, 2009 12:26:39 GMT
Thinking of converting a 3 litre mk2 from cross-plies to radials. Read a lot about which ones to go for here and elsewhere and for my budget Vredestein 185/15s look the best bet. Anybody know any reason not to go for this make? I know I could spend ( a fair bit) more on Avons etc. but are they worth it? Car only does about 3000 mainly dry miles a year but does involve some motorway runs at 70+mph. Would I have to tell my insurance company? i.e. is cross-ply to radial conversion a 'modification'?
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Post by Phil Nottingham on Jul 25, 2009 10:18:26 GMT
It is a very good idea to change for safety and availablity of tyres not counting general comfort and road holding as 185/15 (and 205/7 x 15) are the industry conversions stricktly there is no need to notify the insurance company/. I always do of any deviations/mods from standard however to make sure. It is a standard policy condition including accessories.
Just say it is for safety and is the recommended size and you will have no problem
The make is a good one for a P5 or P5B - i have used them in teh apst and they wear well but remember mileage tread wear is not usually an issue with classics it is age - 10 years max is good for safety
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Post by suffolkrover on Aug 3, 2009 13:19:08 GMT
Some die-hards say radials make the steering more vague and woolly and wish they had stayed on cross-plies. As radials have a smaller rolling circumference they must alter the speedo accuracy and lower the overall gearing - would this be by much?
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Post by Phil Nottingham on Aug 3, 2009 14:10:57 GMT
Correct but if you get 185x15 or 205/70 x 15 its hardly noticeable and safety aspect and roadhol;ding is far superior. They have been fitted by discerning drivers since 1970 although X plies were always standard modern road conditions are not the same
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Post by eisdielenbiker on Aug 4, 2009 13:42:11 GMT
Don't 'C'-suffix radials intended for vans combine both radials and cross-plies advantages somehow? I suppose that after searching an all season tyre to replace my wrong 195/70-15 summer Hankooks. I have found the Hankook RA10 all season tyre with Commercial declaration. They state it had special reinforced side walls. Isn't the stiffness of the sidewall what makes a cross plie different and more appropriate to the P5 suspension ? I could use lower tyre pressure again. Would you use those C-tyres ? Mark
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Post by Phil Nottingham on Aug 4, 2009 15:32:45 GMT
In the use of "C" tyres would invalidate your insurance as they do not have the spped rating the car is therortically capable of notwithstanding it is illegal to go faster than 70 mph anyway. SR in the minimum but HR or VR is better for V8's if a lot of high speed driving is done
But you are correct about the sidewall stiffness although not all are as stiff as others
See also Sticky in P5B section
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Deleted
Deleted Member
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Post by Deleted on Aug 4, 2009 21:49:38 GMT
Don´t buy "C" tyres. C stands for commercial (vans and lorrys) and in my opinion the ride quality will suffer. I had 195/80C Federal on my Mk III, it was terrible tyres. They are reinforced and have a hard ride. Buy 185R15 or 670-15. If you want a "all season" tyre try Cooper 205/75-15 m+s, same diameter as 670-15 and thin tread. I don´t know the insurance rules in Germany but in Sweden the insurance company's don´t care as long as your tyres is not worn out
Regards
Lars
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Post by suffolkrover on Aug 7, 2009 16:03:28 GMT
Would I need inner tubes with radial conversion or are they tubeless?
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Post by Phil Nottingham on Aug 7, 2009 19:09:30 GMT
Tubeless but replace the valves - standrad fortunately with Rostyles - older large type valves with 3 Litres. It is not recommended to use tubes in tubeless tyres as they can be chaffed by the inside of the cover.
Make sure rim is cleaned of corrosion, sealant is used and wheels balanced especailly at front.
It is wise to check the tracking - Parallel to 1mm TI - make sure track rod ends and pwwer steering are not slack as the wider 205 tyres place heavier loads on them than the 185 or X plies
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Post by suffolkrover on Sept 7, 2009 19:10:55 GMT
Got new Vredestein tubeless radials on car fitted by previous owner but they have all been done with tubes. Had to have a puncture repair done on one and asked tyre bloke to leave out tube but he said the wheel was for tubes only and couldn't be done tubeless. Any ideas? Wheels are standard P5 3litre as far as I can tell.
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Post by Phil Nottingham on Sept 7, 2009 21:09:04 GMT
All P5 wheels are tubeless - but the 3 Litre use the old wide upll in tubeless valves that modern tyre fitters do not know exist or if they do, do not where to buy them. (Vintage Tyres, Northants Tyres Longstone all do them) Early P4 tyres were not suitable - 1955/56
Its not a good idea to fit tubes into tubeless anyway as the internal tyre ridges chafe the the tube.
Vreidestien is good tyre for a P5/P5B
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rcoups
Rover Fanatic
Posts: 148
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Post by rcoups on Jun 22, 2010 17:09:43 GMT
What air pressure would be best in them
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Post by stantondavies on Jun 23, 2010 21:06:25 GMT
I've used 30-36lb/sq in over the years depending on how stiff the sidewalls were. eg 30 in Michelin ZVX but 36 in Kumho. Currently using Hankooks with 32lb/sq in.
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Post by suffolkrover on Apr 4, 2011 19:16:21 GMT
Would Avon Textile 205HR15 tyres be ok on the P5/P5B? Although Radials they look like cross-plies, in fact they are 0.5ins bigger in diameter than 6.70/15. Anybody tried them at all, they're not cheap though?!
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Deleted
Deleted Member
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Post by Deleted on Apr 4, 2011 19:58:47 GMT
Federal tyres are good value in that size, I bought a set from www.blackcircles.com, next day postage for a fiver
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Post by Phil Nottingham on Apr 4, 2011 21:57:38 GMT
the 205's are really too wide and place heavy loads on the power steering and ball joints - quite have them fitted and I did once but still best avoided unless they are cheap which they once were
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Post by cooper on Jul 2, 2018 12:48:19 GMT
Hello, Do toi knowwat IS thé exact valves type for 3 .litres ? DoesTr413 fit ? Thanks
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Post by Phil Nottingham on Jul 2, 2018 22:05:08 GMT
They are the old large type, not the modern small diameter ones. Some tyre fitters do not stock them. I seem to recall they were T415 when I last sourced them. I will look one out.
I posted this some years ago so you can perhaps search it?
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Post by cufaudep5bcoupe on Jul 3, 2018 14:22:35 GMT
I have 4 totally unused Vredesteins available for sale. Here's the story.
Just over a year ago I bought a P5b, and am part way through the process of restoring her. One of my concerns, however, was that I could not find a source of tyres at sensible money. My regular chap said he had ordered some from Vredestein, but they would not manufacture a batch until they had sufficient orders.
So I waited...and waited...and waited.
Eventually however they came into stock and I got them fitted. I have to say that I think they look great...and somehow are in keeping with the era of the car.
Last week I went back to the place where I bought the car, as a pal had agreed to buy a 1948 Vauxhall from the same source...a widow clearing out her late husband's gear. There were some "tyres in the garage"...but not for the Vauxhall - 4 unused Vredesteins.!! Never fitted; never used, and dry stored in an enclosed garage. I don't know how old they are, but I'll never use them, so they were going to go on e bay.....So...let me know if you want to make me an offer, and I can send you my e mail address.
They are in Bucks, but I plan to bring them to my home near the A1 / A14 junction in the next few weeks.
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Post by lagain on Jul 3, 2018 20:38:41 GMT
Unfortunately you do need to check the date of manufacture. Current advice from the tyre industry is that tyres that have not been fitted to a car by the time they are 6 years old should be destroyed. If new tyres are fitted to a car, with use, they can be kept on the car for 10 years - if not worn out. According to Auto Express, in 2016, 30 people were killed on the roads due to defective tyres, a frightening statistic.
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Post by djm16 on Jul 4, 2018 15:04:13 GMT
FWIW, I have just fitted Dunlop SPLT5 195R15 tyres to my 3-litre. They replace the 185/80R15 Hankook Optimos that were on it before.
According to the supplier, they are a closer match to the 6.70R15 specified in the manual.
Yes they are a light truck tyre, but I cannot say they are noisier than Hankooks, at least not after I corrected the tyre pressures. They had been fitted at 40psi in 3 of them and 56 in the last!
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Post by enigmas on Jul 4, 2018 22:58:06 GMT
FWIW, I have just fitted Dunlop SPLT5 195R15 tyres to my 3-litre. They replace the 185/80R15 Hankook Optimos that were on it before. According to the supplier, they are a closer match to the 6.70R15 specified in the manual. Yes they are a light truck tyre, but I cannot say they are noisier than Hankooks, at least not after I corrected the tyre pressures. They had been fitted at 40psi in 3 of them and 56 in the last! Wow...that's a lot of pressure on the first 3 let alone the last tyre! The tyre fitter must have returned to the job after a tea/lunch break. So what pressure do you run them at?
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Post by djm16 on Jul 11, 2018 1:15:28 GMT
36 Front 32 Rear
The tyres are rated for a maximum load of 950kg at 65 psi.
Assuming that the load per front wheel is 500kg, then 34 psi would be proportionate pressure based on the maximum load rating (65 x 500/950).
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Post by enigmas on Jul 11, 2018 6:52:56 GMT
It's the harshness of the ride (with high pressures) that concern me more. The P5 does have a very primitive suspension system essentially designed for crossply tyres.
PS. Could someone/anyone explain the benefit of a front suspension system that uses spring steel leafs in torsion (perhaps in another post) What are the benefits if any in ride quality or handling?
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Post by djm16 on Jul 13, 2018 2:32:27 GMT
Of the various vehicles we own, I rate the harshness of ride in descending order:
Landcruiser 100 series Rover P4 Rover P3 Forester 2004 Rover 3-litre.
The complete description on the tyre wall is:
Sidewall 2 ply polyester Tread 2 ply polyseter, 2 ply steel, 1 ply nylon.
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