Round Arch GP4

[BAS]

I was wondering what size rear wheels have been fitted to the round arch gp4 Hawks as 345's look to wide & stick out from the body work and SVA may be a problem.

[strat6v]

295 section tb's or yoko avs, as fitted to Bernards car or Chris Smith's. admittedly both square arch but they will fit and look ok.

[DaveAk]

Bas,

I've got 345's on my round arch Group4 Hawk, and they dont stick out beyond the arches. I'll try to post some pictures.

More of a problem is tramlining on the motorway ruts in the slow lane - be warned!

Best wishes

Dave

[tryphon]

295s round arches:

[BAS]

Dave

Photos would be helpful. I see from some old threads that you converted to GP4, maybe there are some differences between the add on kit and the supplied GP4 kit from Hawk?

I can’t inset my wheels anymore as I only have approx 5mm of clearance between the strut & the tyre, and this still leaves 10mm of tyre beyond the arch.

How much strut to tyre clearance do you have?

Cheers
Brent.

Bas,

I've got 345's on my round arch Group4 Hawk, and they dont stick out beyond the arches. I'll try to post some pictures.

More of a problem is tramlining on the motorway ruts in the slow lane - be warned!

Best wishes

Dave

[Sptwoman]

Brent, What rims are you using? Type / size? I'm using Gerry's and they're on the edge but legal / SVA. When it comes to tyres it appears the 295's are the best for performance, handling and clearance option. I've spoken to several members who have experienced many options and 295's seem to win...

[BAS]

compomotive split rims (Guy's old wheels) 12". 5" outer rim, 6" Inner rim + the width of the centre / Hub. I'll have to check the offset. Do you know the offset for the coffin spokes?

Brent, What rims are you using? Type / size? I'm using Gerry's and they're on the edge but legal / SVA. When it comes to tyres it appears the 295's are the best for performance, handling and clearance option. I've spoken to several members who have experienced many options and 295's seem to win...

[BAS]

The offset et is -27.2mm

compomotive split rims (Guy's old wheels) 12". 5" outer rim, 6" Inner rim + the width of the centre / Hub. I'll have to check the offset. Do you know the offset for the coffin spokes?

[Chris J]

Dave

Photos would be helpful. Brent.

Brent, I've got some of Dave's car.

If you've noticed the wheels on the back of Paul Hassall's Alitalia car, I think they must have more offset?

[Chris J]

From the front side:

[Chris J]

Paul H's car:

[BAS]

Thanks for all the input & the photos.

Looking at the rear of Daves car it looks to have quite a lot of negative camber 1.5 deg or more. I have adjusted the rear camber on my car using cambolts in the upper bolt hole of the upright as I had +1 deg on one side and have now set around -.5 each side, but to get clearance on the strut to tyre I had to add a 5mm spacer one side & 10mm the other. I think that there maybe some manufacturing differences between the two rear uprights. Anyone else noticed this? I also have the fix length lower arm so can't adjust the camber that way, but that would only push the wheel further out.

[Sando]

Hi Brent
I have to run 10mm spacers with my road wheels (345s) to miss the struts. I think there are tolerance differences either with the struts / uprights as mine are very slightly different too, one is slightly closer than the other. However...I wouldn't use odd spacers either side.... Keep them the same and set up your camber with them on, you may have one wheel a few mm further out of the bodywork one side, but better that than have any offset from your centreline. Don't forget some toe in on the rear too. :)

I think the Hassle Brothers car with the round arches -does only just, if not quite cover their 345s I remember from following them around in France. And they run it quite high at the back too to miss any wheelarch interference.

As a plan B you could always swap wheels with someone for a week or so while you get your SVA sorted? New 345s with 8mm of tread may also throw your speedo out slightly. Slightly smaller rolling dia is what you need. Worn down 285s with 18PSI did the trick for me with the standard Fiat speedo..... They went to the great rubber recycler in the sky a long time ago though.

Glad it's all moving along. Looking forward to hearing that Vx rasping again.

Bobster

[SUSIT]

Thanks for all the input & the photos.

Looking at the rear of Daves car it looks to have quite a lot of negative camber 1.5 deg or more. I have adjusted the rear camber on my car using cambolts in the upper bolt hole of the upright as I had +1 deg on one side and have now set around -.5 each side, but to get clearance on the strut to tyre I had to add a 5mm spacer one side & 10mm the other. I think that there maybe some manufacturing differences between the two rear uprights. Anyone else noticed this? I also have the fix length lower arm so can't adjust the camber that way, but that would only push the wheel further out.

Not sure at all about using spacers of differening sizes when putting the car for an SVA. wonder if any of the others can comment on this Have you ever tried measuring from the centre line out to the struts and hub face to see if its all straight

[SUSIT]

Great minds Rob or Fools

Stephen

[Sando]

As a plan B you could always swap wheels with someone for a week or so while you get your SVA sorted?

...Just thought, still got those wheels I bought from you. I'm going to be using the fronts, but not the rears at the mo. When it comes to the crunch you could use them with some sensible tyres on for SVA if you wanted. Were they only 8"s or 9"s can't remeber, but may do you.


Stevie
Aye. You've been listening to young Gordon then :)

[SUSIT]

...Just thought, still got those wheels I bought from you. I'm going to be using the fronts, but not the rears at the mo. When it comes to the crunch you could use them with some sensible tyres on for SVA if you wanted. Were they only 8"s or 9"s can't remeber, but may do you.


Stevie
Aye. You've been listening to young Gorden then :)


Aye I do lots of listening to billy bunter but not much else :p :D :D
On my third redo of the rear suspension because of him, It had better work :rolleyes:

Stephen
Ps RAV replaced by Civic sport today :)

[BAS]

Thanks for the offer Rob. I think they are 8" but I'm not sure.

As for the spacers I was only using odd ones to move the car around the garage. It also highlighted the differance between the sides. It also highlighted that the arches are also different side to side by about 10mm.



[QUOTE=Sando]...Just thought, still got those wheels I bought from you. I'm going to be using the fronts, but not the rears at the mo. When it comes to the crunch you could use them with some sensible tyres on for SVA if you wanted. Were they only 8"s or 9"s can't remeber, but may do you.

[Sptwoman]

Brent, The arch differences were highlighted in an earlier thread. I've noticed several completed cars are the same. I made a paper image of the offside and layed it on the nearside... see below.

[Sptwoman]

The nearside flairs out by 10mm at the rear. I cut and shut to compensate.. Looks ok now it's finished and it won't be looking at me to fix over another winter... :rolleyes:

[Sptwoman]

back on the car.......yes, it's close...

[BAS]

Thanks Sptwoman, I was looking at the early GP4 Round arch style. Are those Gerrys Coffin spokes I see. Could you measure the overall width outside edge to outside edge and do you know the offset.

PS that's quite some cut n shut you've done, is your garage door very narrow. ;)

[BAS]

After lots of measuring and adjusting both wheels are now set with same amount of camber, must have had an off day when I set it up before o/s -.5 deg n/s +.5 deg. :rolleyes:

10mm spacer each side and -0.5 deg camber.
I had to elongate the lower hole on the nearside strut by 1.5mm towards the outer edge as I had run out of adjustment on the cambolt in the upper hole.

So now the 345's look right. :)