darren(SA)
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| posted on 22/11/03 at 04:18 PM |
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14 inch vs 15 inch
Hi guys, trying to decide on the above, ignoring costs, do i go for 14" with 60 profiles or 15" with 50 profiles?
I'm well aware of the diff in road cars as I moved my golf from 14's to 15's.down to better handling vs better comfort i suppose.
How many guys are running 15's? I would be keen on these but I have heard some rumours that 15's are a very hard ride for a locost, any
opinions?
thanks
darren
[Edited on 22/11/03 by darren(SA)]
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Stu16v
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| posted on 22/11/03 at 05:00 PM |
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Ok, you asked.....
13's. Smaller, lighter, cheaper, and more suited to the car type IMHO....
Saying that, mine is on 15's, but for different reasons. My car is slightly bigger, so I thought 15's would look more 'in
keeping' with the scale. And I dropped on some alloys at the right price 
Dont just build it.....make it!
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Metal Hippy
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| posted on 22/11/03 at 05:13 PM |
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I'm told an inch makes all the dfference.... 
Cock off or cock on. You choose.
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theconrodkid
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| posted on 22/11/03 at 05:16 PM |
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so em keeps saying
who cares who wins
pass the pork pies
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ChrisW
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| posted on 22/11/03 at 05:52 PM |
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15s all the way. You know it makes sense. Who wants comfort in a Seven??
Chris
My gaff my rules
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craig1410
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| posted on 22/11/03 at 06:33 PM |
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I will have to go for 15's on mine as I am using Sierra rear disc brakes and they won't fit in 13's or 14's (They will fit in
14" steel wheels due to them having thinner walls than equivalent alloys but I don't want steel wheels on my wagon thanks very much...)
I would have gone for 13's to take advantage of cheaper tyres as I expect my Rover V8 will probably eat tyres but as I said they won't
fit. The other advantage of 13's is that I understand they are quite a bit lighter (wheel and tyre) than an equivalent rolling radius 15"
(wheel and tyre again) and this can affect acceleration in the lower gears. If you are planning on drag racing or sprinting then 13's would be
much better I'd expect due to the smaller rotational inertia and also the taller aspect tyre should give more grip off the starting line,
especially if crinkle walled tyres are used. 
HTH,
Craig.
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Mark Allanson
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| posted on 22/11/03 at 07:22 PM |
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I am going to use 185 70 13's, because they are cheap, easily available and as has been said before, they suit the car.
The biggest advantage is that you still have handling. lower profile tyres do increase the grip, but at the expence of feel. The difference between
being on the limit and upside down in a ditch is far less with low profiles. The 70 series will squeel, kick, thow tantrums and generally give you
loads of warning before they let go, and when they do it is more progressive, easier opposite lock and easier regain of control. 45 series are lethal,
everything is fine at high cornering speeds until they aren't and then your dead.
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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Mark Allanson
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| posted on 22/11/03 at 07:24 PM |
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Forgot to mention, the 70's put a lot less strain on the suspension components and chassis brackets.
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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craig1410
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| posted on 22/11/03 at 08:07 PM |
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Mark,
What brakes are you using on the rear? Drums I'm guessing?
Don't take this wrongly, I got a Sierra disc setup virtually for free so I used that and was too far down that path before I realised the
problem with caliper clearance. Drums are fine (on the back anyway...) and will probably give you a better handbrake which as you know is very handy
for stopping the car rolling down hills when out shopping
I may end up with 14" steel wheels initially due to lack of funds and this may prove to be a happy compromise. If I can find some alloys which
will clear my calipers then I'd be more than happy with 14" wheels (same for 13's but much less likely due to clearance). I know
what you mean about 45 series tyres as I have some on my Rover Vitesse Turbo (215/45 17) and they have never even chirped a hint of a squeal before
letting go. Fortunately (in this case) the car is front wheel drive so at least I get to see what I'm about to hit and have a chance to back off
and avoid it!!
Cheers,
Craig.
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Mark Allanson
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| posted on 22/11/03 at 08:17 PM |
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My back end is capri, so I am using capri RS wheels. I do have a set of 14" sierra pepperpots which you could have FOC except for the 1600 mile
round trip to collect them!
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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craig1410
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| posted on 22/11/03 at 08:26 PM |
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Ah that's less than a 10 hour trip for my trusty Vitesse...especially if I tweak my turbo boost up a few psi...
Are Sierra pepper pots alloy then? If so, do you happen to know if they can accommodate disc brakes?
I had a nice set of Capri Laser alloys which are more or less the same style as the RS ones but when I tried them on with the sierra discs I
couldn't even get my little finger between the disc and the wheel and had absolutely zero chance of getting a caliper in there. I sold them to
another builder from the forum a while back. A shame because they would have been ideal...
Cheers,
Craig.
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Mark Allanson
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| posted on 22/11/03 at 08:33 PM |
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They are off my donor, equipped with drums, so I cannot say for sure, I am sure that someone can confirm
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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steve m
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| posted on 22/11/03 at 11:40 PM |
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Just for info I have the 7 spoke 13" rs style wheels on my car at the moment , I also have 5 capri pepperpots that used to be on it, and neither
style will fit on a k reg sierra, as the front brakes were to big
my next plan is to fit 14 or 15 wheels
Also what might be a silly question but,
If I was to fit larger discs with my existing 4 pot calipers would my brakes be better ?
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craig1410
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| posted on 22/11/03 at 11:52 PM |
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I'm no expert but my logic goes something like this:
If you have the same friction pad area (size of pad assuming it still contacts disc correctly) and the same contact pressure (same caliper, master
cylinder and pedal setup) then using a larger disc will increase the maximum braking torque for the same pedal effort due to the increased
"leverage".
I don't know how far you can stretch this though because eventually the design of the caliper will restrict the size of disc as the disc will
tend to hit the top and bottom of the caliper body and thus the pad area will not be fully utilised near the centre of the pad. Diminishing returns
will result once you get to this stage.
HTH,
Craig.
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darren(SA)
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| posted on 23/11/03 at 10:06 AM |
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quote:
15s all the way. You know it makes sense. Who wants comfort in a Seven??
I think you got a good point, i dunno if you saw I had a post going a little while back where I was moaning about my rear suspension floating all over
the show, so it is evident that I'm going for handling, its still a bit of a debate tho. In SA there are so many diff types of mags and the diff
btwn 14's and 15's could be as low as R200, tyres not bad either, good set of dunlops ( 50's ) for around R500 each, so the cost factor
doesn't play a major part.
check this picture out, set of mags from a golf VR6 on a picture that I 'borrowed' from who knows where (greatest compliments), these are
15's and i could get hold of a set quite easily for around R2000.
 
Rescued attachment lotus7.jpg
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ChrisW
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| posted on 23/11/03 at 11:05 AM |
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Bigger wheels = better looks 
I'm going to be running 18" alloys with 35 profile tyres 
Chris
My gaff my rules
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paulf
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| posted on 23/11/03 at 03:48 PM |
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Mark are you sure about the easy availability of these tyres? i want to use them for much the same reasons but as i have mentioned elsewhere there
appears to be little choice of quality tyres in this size the best choice of 13 inch tyres is 60 series which does not give good gearing.I have tried
to obtain used tyres but all the local suppliers have told me that 185-70-13 is now an obselete size. There is some choice of 175-70-13 as it is still
a commonly fitted size but i think they would be to narrow.
Paul.
quote:
Originally posted by Mark Allanson
I am going to use 185 70 13's, because they are cheap, easily available and as has been said before, they suit the car.
The biggest advantage is that you still have handling. lower profile tyres do increase the grip, but at the expence of feel.
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Mark Allanson
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| posted on 23/11/03 at 10:12 PM |
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I checked with my tyre supplier (the one selling the Formula 27). He offered me several types of 185 70 13's, varying from budget at £20, to
michelins at £39. I am going to fit budgets first until I get the suspension set the way I want it, as I am sure they will be ripped to shreds in
about 2 months.
The 185's are easily available, but he had none in stock, but could get them in at 24 hours notice.
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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Peteff
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| posted on 23/11/03 at 11:27 PM |
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I bought 4 Vredestein 165/65x13 for my car to get the gearing right for SVA speedo check, but they look like roller skate wheels. I like them on the
front but would like some 185/70's for the rear. They are good tyres and look the part, nice square profile. I got a discount for buying 4 at
once so it's worth asking round unless you know the dealer.
yours, Pete.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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mackie
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| posted on 24/11/03 at 11:59 AM |
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Craig, we got 5x 14x5.5 inch alloy wheels with our Ghia 4x4 Sierra so I can definately say they fit over the rear brakes.
They are fitted with 195/60 tyres which should be fine I think.
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Bob C
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| posted on 24/11/03 at 12:13 PM |
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Go up to 17 inch rims for looks but unsprung weight suffers. A 7 on a truck axle is already iffy on unsprung weight. 13" and 15" give best
tyre choice, I'm using 14" & you simply can't get some tyres in that size.
Solifworks say's I can use 10.5" discs in the 14" wheels - I look forward to seeing whether real life agrees....
Cheers
Bob C
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craig1410
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| posted on 24/11/03 at 12:56 PM |
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Bob,
Ah but does solidworks know about the caliper??? I got my Sierra rear discs inside the 13" capri laser wheels but there was no room for the
caliper to wrap around it...
Interesting point about the tyre availability for 14" being lacking. I may rethink my intention to go for 14" in favour of 15".
Thanks for that!
Cheers,
Craig.
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craig1410
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| posted on 24/11/03 at 01:02 PM |
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quote:
Originally posted by mackie
Craig, we got 5x 14x5.5 inch alloy wheels with our Ghia 4x4 Sierra so I can definately say they fit over the rear brakes.
They are fitted with 195/60 tyres which should be fine I think.
Thanks Mackie, I will keep an eye on the local papers for any such cars being scrapped although as Bob was just pointing out, tyre choices may be
limited and may warrant me moving to 15" wheels.
One other thing which I have come to accept is that I don't believe that I need to stick to the standard offset for my wheels (ET18/19) and will
most likely use a 38mm offset as the choices are much greater. I have more than enough body clearance on the back to allow these to fit and on the
front I already have more scrub radius than I want so handling may even be improved. I don't want to trigger another scrub radius argument but
just wondered if anyone else has decided to broaden their choices by going for wheels with a more common offset such as 38mm and whether they had any
issues which I have not considered.
Cheers,
Craig.
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mackie
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| posted on 24/11/03 at 01:17 PM |
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I personally haven't noticed a problem with tyre choices for 14inch wheels. I guess it depends on what you are after but it should not be at all
difficult to get good value, good performing tyres on 14in rims. For example Pirelli P6000s or Yoko A539s.
I think we're just going to keep it locost and use the sierra alloys, they are the same as the ones on conrod's car and don't look
too shabby for effectively free wheels. The tyres on them seem virtually new but are budget items.
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mackie
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| posted on 24/11/03 at 01:19 PM |
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You may want to ease up on the old avatar sizing there craig!
[Edit]
Ah, you did
[Edited on 24/11/03 by mackie]
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