83 replies to this topic

[techieboy]

I get occasional rubbage with 195/50 R888's fitted to the "correct" TMS TD's.

[siztenboots]

I get occasional rubbage with 195/50 R888's fitted to the "correct" TMS TD's.

They have an overall width of 203mm

http://www.toyo.co.u...s&product_id=18

[Ouchie]

...
speed sensor is in the nearside rear hub , so not change to mileage or speedo

unfortunately any tyres sizes eg. 195/40/17 are just a rough guide and won't be in any way exact or comparable. For instance the Kumho KU31 205/50/16 which several people have fitted to a 16" rim has an actual width of 214mm so very wide.

I went for 205/45/16 and get no rubbing on TMS spec TDs.
They do look too small though, lowering the front to look good gives a rake of about 20mm and a very low front number plate

[martinmulligan]

Thanx for that helpfull reply I have seen the 195 45 option for the 5.5 front wheel before but am struggeling to find a suppyler. Have been told they have stopped making them, both yoko and goodyear and I have a friend in the tyre trade. Is the 195 40 a good option. How big of a spacer will be needed to fit a rear wheel on the front with a 205 45 tyre?

Cheers Rob.

Rob do a search for "Kumho" as I know some people have fitted the KU31 tyre in the 195/40x17 size

I'm currently running Goodyear F1s and just had a search of the likely suppliers (though expect them to last another year or so as they're barely worn) and it does look like you can't get anything in 195/45x17 now

there is much more choice in 195/40/17 size

And then your rolling radius is out by -36mm and you will probably end up with less grip on the front as there will be less sidewall flex

if you can quote a reference source for where you managed to find the exact dimension of -36mm , as in the past we have tried to get details for the KU31 195/40/17

in terms of rolling circumference exact details , the standard 17" are 175/55 so rolling circumference is 1903mm according the Bridgestone datasheet ( http://www.bridgesto...oneDatabook.pdf )

Sorry i meant overall tyre diameter is -36mm. The 175/55 is 624mm and 205/40 is 588mm

After calculating this but bearing in mind i am stupid..

175/55/17:
Rolling radius 196.13cm
Diameter 62.43cm
Sidewall height 9.63cm

195/40/17:
Rolling radius 184.66cm
Diameter 58.78cm
Sidewall height 7.80cm

As the speed sensor is in the front hub the speedo will be approx 4mph @60mph

speed sensor is in the nearside rear hub , so not change to mileage or speedo

unfortunately any tyres sizes eg. 195/40/17 are just a rough guide and won't be in any way exact or comparable. For instance the Kumho KU31 205/50/16 which several people have fitted to a 16" rim has an actual width of 214mm so very wide.

My mistake i thought it was in the front..
Obviously there will be a variation as by increasing the psi you can increase the rolling radius.
My calculations are on the tyre size and not the rim width.
The lower the profile on the tyre there will be more chance of it breaking traction hence why i chose to do my wheels this way.
Do you know the rim width and offset of the rears?
And also what is the offset of the 214mm 16mm wheel?

[siztenboots]

...
speed sensor is in the nearside rear hub , so not change to mileage or speedo

unfortunately any tyres sizes eg. 195/40/17 are just a rough guide and won't be in any way exact or comparable. For instance the Kumho KU31 205/50/16 which several people have fitted to a 16" rim has an actual width of 214mm so very wide.

I went for 205/45/16 and get no rubbing on TMS spec TDs.
They do look too small though, lowering the front to look good gives a rake of about 20mm and a very low front number plate

downsides there are ,
fuel tank reading slightly affected
headlights / driving lights aim lowered

[martinmulligan]

...
speed sensor is in the nearside rear hub , so not change to mileage or speedo

unfortunately any tyres sizes eg. 195/40/17 are just a rough guide and won't be in any way exact or comparable. For instance the Kumho KU31 205/50/16 which several people have fitted to a 16" rim has an actual width of 214mm so very wide.

I went for 205/45/16 and get no rubbing on TMS spec TDs.
They do look too small though, lowering the front to look good gives a rake of about 20mm and a very low front number plate

I thought that and was worried the car would end up looking like a pram!

[martinmulligan]

...
speed sensor is in the nearside rear hub , so not change to mileage or speedo

unfortunately any tyres sizes eg. 195/40/17 are just a rough guide and won't be in any way exact or comparable. For instance the Kumho KU31 205/50/16 which several people have fitted to a 16" rim has an actual width of 214mm so very wide.

I went for 205/45/16 and get no rubbing on TMS spec TDs.
They do look too small though, lowering the front to look good gives a rake of about 20mm and a very low front number plate

downsides there are ,
fuel tank reading slightly affected
headlights / driving lights aim lowered

EXACTLY!!!

[siztenboots]

Thanx for that helpfull reply I have seen the 195 45 option for the 5.5 front wheel before but am struggeling to find a suppyler. Have been told they have stopped making them, both yoko and goodyear and I have a friend in the tyre trade. Is the 195 40 a good option. How big of a spacer will be needed to fit a rear wheel on the front with a 205 45 tyre?

Cheers Rob.

Rob do a search for "Kumho" as I know some people have fitted the KU31 tyre in the 195/40x17 size

I'm currently running Goodyear F1s and just had a search of the likely suppliers (though expect them to last another year or so as they're barely worn) and it does look like you can't get anything in 195/45x17 now

there is much more choice in 195/40/17 size

And then your rolling radius is out by -36mm and you will probably end up with less grip on the front as there will be less sidewall flex

if you can quote a reference source for where you managed to find the exact dimension of -36mm , as in the past we have tried to get details for the KU31 195/40/17

in terms of rolling circumference exact details , the standard 17" are 175/55 so rolling circumference is 1903mm according the Bridgestone datasheet ( http://www.bridgesto...oneDatabook.pdf )

Sorry i meant overall tyre diameter is -36mm. The 175/55 is 624mm and 205/40 is 588mm

After calculating this but bearing in mind i am stupid..

175/55/17:
Rolling radius 196.13cm
Diameter 62.43cm
Sidewall height 9.63cm

195/40/17:
Rolling radius 184.66cm
Diameter 58.78cm
Sidewall height 7.80cm

As the speed sensor is in the front hub the speedo will be approx 4mph @60mph

speed sensor is in the nearside rear hub , so not change to mileage or speedo

unfortunately any tyres sizes eg. 195/40/17 are just a rough guide and won't be in any way exact or comparable. For instance the Kumho KU31 205/50/16 which several people have fitted to a 16" rim has an actual width of 214mm so very wide.

My mistake i thought it was in the front..
Obviously there will be a variation as by increasing the psi you can increase the rolling radius.
My calculations are on the tyre size and not the rim width.
The lower the profile on the tyre there will be more chance of it breaking traction hence why i chose to do my wheels this way.
Do you know the rim width and offset of the rears?
And also what is the offset of the 214mm 16mm wheel?

standard rear wheel is 7.5J and ET35 offset
standard front wheel is 5.5J and ET26 offset

typical Team Dynamics wheel as supplied by TMS
front is 16" 7J , ET20 ( this gives an additional 12mm overall increase in front track )
rear is 17" 7.5J ET35 ( although you can get them made in ET30 for 10mm extra rear track and avoid rubbing )

e&oe

[martinmulligan]

Thanx for that helpfull reply I have seen the 195 45 option for the 5.5 front wheel before but am struggeling to find a suppyler. Have been told they have stopped making them, both yoko and goodyear and I have a friend in the tyre trade. Is the 195 40 a good option. How big of a spacer will be needed to fit a rear wheel on the front with a 205 45 tyre?

Cheers Rob.

Rob do a search for "Kumho" as I know some people have fitted the KU31 tyre in the 195/40x17 size

I'm currently running Goodyear F1s and just had a search of the likely suppliers (though expect them to last another year or so as they're barely worn) and it does look like you can't get anything in 195/45x17 now

there is much more choice in 195/40/17 size

And then your rolling radius is out by -36mm and you will probably end up with less grip on the front as there will be less sidewall flex

if you can quote a reference source for where you managed to find the exact dimension of -36mm , as in the past we have tried to get details for the KU31 195/40/17

in terms of rolling circumference exact details , the standard 17" are 175/55 so rolling circumference is 1903mm according the Bridgestone datasheet ( http://www.bridgesto...oneDatabook.pdf )

Sorry i meant overall tyre diameter is -36mm. The 175/55 is 624mm and 205/40 is 588mm

After calculating this but bearing in mind i am stupid..

175/55/17:
Rolling radius 196.13cm
Diameter 62.43cm
Sidewall height 9.63cm

195/40/17:
Rolling radius 184.66cm
Diameter 58.78cm
Sidewall height 7.80cm

As the speed sensor is in the front hub the speedo will be approx 4mph @60mph

speed sensor is in the nearside rear hub , so not change to mileage or speedo

unfortunately any tyres sizes eg. 195/40/17 are just a rough guide and won't be in any way exact or comparable. For instance the Kumho KU31 205/50/16 which several people have fitted to a 16" rim has an actual width of 214mm so very wide.

My mistake i thought it was in the front..
Obviously there will be a variation as by increasing the psi you can increase the rolling radius.
My calculations are on the tyre size and not the rim width.
The lower the profile on the tyre there will be more chance of it breaking traction hence why i chose to do my wheels this way.
Do you know the rim width and offset of the rears?
And also what is the offset of the 214mm 16mm wheel?

standard rear wheel is 7.5J and ET35 offset
standard front wheel is 5.5J and ET26 offset

typical Team Dynamics wheel as supplied by TMS
front is 16" 7J , ET20 ( this gives an additional 12mm overall increase in front track )
rear is 17" 7.5J ET35 ( although you can get them made in ET30 for 10mm extra rear track and avoid rubbing )

e&oe

And do you know why they use a 16" on the front and not a 17"?

[peterg]

better tyre choice

[martinmulligan]

unfortunately any tyres sizes eg. 195/40/17 are just a rough guide and won't be in any way exact or comparable. For instance the Kumho KU31 205/50/16 which several people have fitted to a 16" rim has an actual width of 214mm so very wide.

Now i'm confused..
A 16" rim with a 214mm width would be called 8.5J not a 7J like you have put surely..

If so then that would be like running a rear wheel on the front..

[peterg]

It's not the wheel rim that is 214mm, it's the tyre width

For instance the Kumho KU31 205/50/16 which several people have fitted to a 16" rim has an actual width of 214mm so very wide

Edited by peterg, 16 February 2010 - 12:30 PM.

[martinmulligan]

better tyre choice

And so the sidewall was higher for more grip turning in..

[martinmulligan]

It's not the wheel rim that is 214mm, it's the tyre width

For instance the Kumho KU31 205/50/16 which several people have fitted to a 16" rim has an actual width of 214mm so very wide

Just what i thought..
Surely the tyre would be called a 215/50 if the width is 214mm?

[G-Bob]

I run 195/40/r17 Khumo's on the front. They are great in the wet, but a word of warning is that it makes the radius more like that of a 16" wheel and therefore plays havoc with the ABS. The best part though is the huge gap in the arch. Mr Donkey was most jealous about the size of my gaps! You can get them quite easily from camskill.

[peterg]

Just what i thought..
Surely the tyre would be called a 215/50 if the width is 214mm?

yeah, you'd think so wouldn't you.... I've come across this many times and is the reason you have to check the actual width of the tyre for clearances around suspension etc

[martinmulligan]

I run 195/40/r17 Khumo's on the front.
They are great in the wet, but a word of warning is that it makes the radius more like that of a 16" wheel and therefore plays havoc with the ABS.

The best part though is the huge gap in the arch. Mr Donkey was most jealous about the size of my gaps!

You can get them quite easily from camskill.

I'm currently using F1 assymetrics which are outstanding. I want to improve the handling whilst keeping the original stance of the car..
Will buy a set of 215/45/17 as the rolling radius/diameter is not that much difference and will hopefully gice me another 5mm before i touch the arb

[G-Bob]

You will never be able to iraddicate understeer on 175 tyres, my car has been set up by steve (scarred stiff) and guess what, still understeers.

If it's setup properly and you're still understeering you are going into the corner far too fast, or you have suspension problems.

[siztenboots]

It's not the wheel rim that is 214mm, it's the tyre width

For instance the Kumho KU31 205/50/16 which several people have fitted to a 16" rim has an actual width of 214mm so very wide

Just what i thought..
Surely the tyre would be called a 215/50 if the width is 214mm?

the actual footprint width of the same tyre , varies if it is mounted on a 5.5J, 6J , 6.5 or 7J rim

in europe they seem to like that stretched look you get on a wide rim , with a narrow tyre

[martinmulligan]

It's not the wheel rim that is 214mm, it's the tyre width

For instance the Kumho KU31 205/50/16 which several people have fitted to a 16" rim has an actual width of 214mm so very wide

Just what i thought..
Surely the tyre would be called a 215/50 if the width is 214mm?

the actual footprint width of the same tyre , varies if it is mounted on a 5.5J, 6J , 6.5 or 7J rim

in europe they seem to like that stretched look you get on a wide rim , with a narrow tyre

Which is extemely dangerous!
You should match the tread with the rim width and not stretch it as the tyre can pull off the rim.
Don't really matter if you have a turbo as you can't go as quick as an N/A through the bends anyway!

Edited by martinmulligan, 16 February 2010 - 01:07 PM.