OT. Car tyre size question

If one has a standard tyre size of 225 x 60 x 16 can one
fit for example a 225 x (55 or 50) x 16 on the rim quite
happily?

Perhaps even go up a size to 230 or 235?

I dunno the answer.

Alan

 

You're only lowering the profile of the tyre which, AFAIK, shouldn't make
any difference with regards to clearance. However, it could look incredibly
gay if you reduce it a lot (ie down to 35/40) and don't up the wheel size.

Depends, an increase of 10 is usually okay but, I'm no expert.

 

Depends on the rim width.
Check the tyre manufacturer's recommendations.
In principle yes.
SWMBO's car has 225/55-16 on 7" rims at the front
and on 7.5" rims on the back.
The 7.5" rims would take up to about a 255 tyre without
spoiling the handling too much. You could go down to about 205
but would always be scraping the rim on the kerb.

And you can't just change the sprockets on a car!

 

said:

http://www.miata.net/garage/tirecalc.html

might help. I think it's java, unfortunately.

 

Talk to these people http://www.xpediatyre.co.uk.
Speak to either John or Graham.

 

Cor, I've not had to think about this for a while. The biggest effect
will be on your speedo - so it depends where it's driven from. If you
don't mind it being inaccurate, then the sky's the limit.

What you're considering is changing the rolling circumference of the
tyre, OK? The 225 figure is the nominal width of the tread from
shoulder to shoulder in millimetres. The 60 figure is the "aspect
ratio" which is the height of the sidewall as a percentage of the
aforementioned width - so a 225/60 is 225mm wide and the sidewall is
<tap tap> 135mm high.

The way it works is that if you go up two width increments and down
one aspect ratio increment the circumference remains approximately the
same (at least as far as gearing and therefore speedo accuracy go),
thus a 225/60 is effectively the same as a 255/50 or a 275/40. Are
you still with me? The only limitation will be your taste in ride
quality which will get harsher as the aspect ratio gets smaller and
the wheelarch to tyre clearance which may be critical on full
lock/full bump with wider rubber.

To answer your question, if you want to go to a 235, it had best be a
55, or a 245/50 to maintain gearing. You'll probably be OK with
clearance, but there again ...

Remember this advice is worth exactly what you paid for it, but it is
accurate as far as it goes, not knowing what car you're talking about
but assuming it's a Jag.

 

Yes it is a Jag, i have sort of decided with regard to ride (i went in a XKR
the other day with 20" wheels and **** all aspect and that was hard) that
i will go to the 235 x 55 size, i reckon if i went 245 x 50 it might look a
bit
horrid.

Thanks for the info, well written and explained. And we have met once,
your the hairy one.

Alan

SP1 for Fun, Jaguar for Comfort.
BOTAFOT #148

 

Thats a handy page, thanks very much.
Now i might change my mind....why did i even start
down this road?

Alan

SP1 for Fun, Jaguar for Comfort
BOTAFOT #148

 

I remember it, Alan. H&J car park, 'FOT and Englands Rose, on a
pleasant sunny day last year. Must do that again, you know.

 

In uk.rec.motorcycles, Mr. Fantastic said:

Or lower the car.

Back in the days when Ford Crapris had 185/70/13s I got a set of
205/60/13s on OK.

 

I have every intention of doing so, when the sodding weather gets better.

Alan

 

Whinging Courier wrote:

I wrote off one of them when it ran me over.

--
Bob
Currently borrowing a black and red Yamaha XJ750 with fuel injection
Present: Honda XL125RF (FS)
Past: Honda CG125
bob at homeurl tomato dot co dot uk
remove the red fruit if you'd like to email me.

 

Er, I'm not. How does changing the width of the tyre change the
circumference?

 

Because the height of a tyre is quoted as a percentage of the width.

ie. if you take the following:

195/60
and
205/60

they'll have different height sidewalls, and therefore a different
circumference. The first tyre is 117mm tall, and the 2nd is 123mm tall.

HTH.

 

Oh yeah, gotcha.

Keep thinking of the sidewalls as measurement in mm rather than %.


Ta!

 

In uk.rec.motorcycles, Bob123 said:

What, the car or the tyre?

 

Previously on usenet, Whinging Courier said...

But they tramlined like a bastard and slid like **** in the wet. I went
back to 185s on my '82 2.0S and it held the road far better.

--
Lozzo : The anti-Timo
ZZR1100D, GPZ500S, CB250RS x3
BOTAFOT#57/70a, BOTAFOF#57, MIB#22, TCP#7,
ANORAK#9, DIAABTCOD#14, UKRMT5BB, IBW#013, MIRTTH#15a/16,
BotToS#8, GP#2, SBS#10, SH#3, DFV#14, BONY#9.
Url for ukrm newbies : http://www.ukrm.net/faq/ukrmscbt.html
http://www.glfuk.com/ for MJK Leathers in the UK.
Artificial intelligence is no match for natural stupidity.

 

In uk.rec.motorcycles, Lozzo said:

I had wheel spacers on mine as well. Every little bump would hear the
rear tyres grinding against the wheel arches ;-)

I don't know about handling better with the 185s as I thought the big
tyres and wheel spacers looked way to cool to remove and the fishtailing
was half the fun ;^)

 

Oh the car, I had bicycled to a mate's flat on Harwood Rd to fix his
computer at about 11:00am and knowing it to be a 2 hour job I didn't
take my lights. Anyway by the time I'd had lunch and taught him how to
use his new scanner and had 2 tins of larger with him it was 4:30, just
the beginning of dusk. I headed up Harwood rd planning on turning right
into Moore Park Road I'm in the bus lane and just about to arrive at the
point when I have to turn so I look over my shoulder and there is
nothing, not even tumble weed, I can see all the way to the kings road
and there aren't even any pedestrians, so with a slightly odd "Day of
the Triffids" feeling I start to move out and look the other way, there
are three cars coming down from Fulham Broadway at quite some speed so I
continue to move out fairly slowly until they pass then start to turn
more quickly, now I know your perception of time around an accident is
screwed up but I can't balance a bike going very slowly and I had only
travelled a couple of meters while this whole thing was going on so it
can't have been more than 4~5 seconds and it felt more like 3, I wasn't
going to bother with another look down towards the Kings Road as I had
just had one. For some reason I did and sure enough there was an old
Ford Crapris doing 40 odd about 20 meters away, he saw me and slammed on
the brakes, by the time he hit me he was probably only doing 25mph odd.

When he hit I was at an angle of about 45 deg to his bumper so the first
bit of me it hit was my leg flipping them up in the air and then I was
picked up by the front of the roof [1] on the fleshy part of my side
between the hip and ribs and catapulted down the road quite an
impressive distance. I ended up on the roads about 10 meters from the
front of the car and about 35 from the point of impact. I didn't loose
consciousness at any point and as soon as I landed on the road I got up
and ran straight to the pavement for fear of being run over again, [2]
then I checked the traffic conditions again and ran back to my now
semicircular bike picked it up and carried it to a railing and chained
it to it to stop the thieving scroats running of with the thing. Then
the adrenalin started to make me feel woozy and I sat on the pavement
and awaited the ambulance like a good boy. I could see the car, the
driver had had to climb out of the window as the doors wouldn't open as
I'd bent the roof frame of the car back at an angle so it pinched the
doors effectively locking them, also at where I'd hit the roof it was
bent back in an inverted snowplough shape about 20 centimetres from its
original position, apparently this was sufficient damage to write of the
car.

When the ambulance arrived they strapped me to a back bored designed for
midgets and the rather sharp edge at the bottom was cutting rather
painfully into my achilles tendon, this was the most painful part of the
whole experience. The Chealsea and Westminster Hospital A&E department
were board and under worked so they all came to work on me [3] and in an
effort to x-ray that tricky bit of spine they can't see I had one junior
doctor on each arm puling them down to expose the vertebra. Anyway I was
fine and they made me spent a night in a ward with the optional periodic
wakeup call to have a torch shoved in your eye, when I walked home in
the morning I was a bit stiff to say the least but sadly [4] I don't
bruise much so only if you looked closely could you see a slight
discoloration.


[1] the bit where the roof and the windscreen meet
[2] noting the slack jawed look on the people in the bus stop
[3] you remember what your mum said about clean shredies at times like
these, I was going commando.
[4] sadly because I love the pretty colours bruises go on some people

--
Bob
Currently borrowing a black and red Yamaha XJ750 with fuel injection
Present: Honda XL125RF (FS)
Past: Honda CG125
bob at homeurl tomato dot co dot uk
remove the red fruit if you'd like to email me.

 

In uk.rec.motorcycles, Bob123 said:

<snip tale of woe>

Thankfully <touches wood> I've never been taken off like that. I've been
nudged a few times and had my course altered by cars touching my rear
wheel and stuff (obviously, I've crashed into lorries and parked cars)
but I've always been in the fortunate position to give them a jolly good
mouthful afterwards