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 Post subject: Re: Hmm.....
PostPosted: Sat Oct 28, 2017 9:24 pm 
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Can you also confirm the wheel-rim widths and wheel-offsets, associated with the various wheels and the rear wheel-arch's inboard & outboard clearances, with the various wheel and tyre combinations!?!

Even with a 185/55 R15 tyre on a 5½J x 15 inch alloy wheel, with a nominally 31 mm wheel-offset, there doesn't seem to be much rear wheel-arch, outboard clearance, on my 1974 Triumph Toledo 1300 "HL".
I don't think this is really the place for this question to have been asked, surely "Dolomite Related" is more appropriate,
anyhow the MGF steel wheels are 14x5.5J. Offhand I don't know the offset but will try measuring it tomorrow.

What I can confirm is that these wheels with 185/65 tyres give clearance on a Sprint (and in fact fill the arches better than Sprint alloys).

http://www.mgf.ultimatemg.com/group2/su ... he_mgf.htm

Ian.
Such a question had been posted in the following thread, but so far there has been no response:

Board index » The Triumph Dolomite Club » Dolomite-related [Start here!] » MGF WHEELS

viewtopic.php?f=4&t=33153

I am not trying to fill the wheel arches, but ensure appropriate clearances between the wheel & tyre assembly and the adjacent wheel-arches & suspension components, under all conceivable driving conditions. Using 185/65 R15 tyres, is predicted to give the overall effective engine gearing I seek, whilst also employing 65-Series tyres for minimum rolling resistance, as well as good overall handing and ride comfort.


I've got no measurements to speak of, but having fitted and run MGF 6x15s for some time, with a variety of tyre sizes I can say this:-

On the front they fit fine and work with either 185/55 or 195/50s. No interference detected under any conditions, even with the suspension lowered beyond the realms of reason (this was not deliberate, at one point in time when my new springs were bedding in and settling, I let it get VERY low before resetting my ride height adjustable shox)

The rear is a different matter, I tried the car initially on 205/50s and these interfered rather badly with the outer arch, even at stock ride height or a bit over, though they missed the inner arch by the narrowest of margins. I have now settled on 195/50s. These still interfere with a standard arch a bit under extreme cornering conditions. Rather than go any narrower on rear tyres, I gave up at this point and turned up the rear arch lips. Several folk have asked why I didn't try the 185/55s that I had available on the rear. The simple answer is that it never occurred to me to try! And now trying is pointless because I have turned up the lips and all is well!

Being a more performance oriented soul, I have not and would not even consider a 185/65 fitment as it permits too much sidewall roll for safe high speed cornering. For your application though, I don't see why it wouldn't work, profile has no significant effect on width. If it will work with 185/55s on the rear,, which others have reported it will (just) then it SHOULD be OK on 185/65s.

However, I would suggest that a 185/65/15 has a noticeably bigger rolling radius than a 155/80/13 (Standard Toledo size) or for that matter a 175/70/13 which is standard Sprint size. Which will probably upset your speedometer and odometer readings.

Steve

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2 door '73 Toledo with Vauxhall Carlton engine OWF 797M (The Carledo)
Vermillion (and Rust) Sprint Auto EGP 247T (The Dolomega)
'91 Cavalier 2ltr 8v auto
'95 Cavalier 2ltr 16v auto
Spectrum Auto Services, Servicing, Repairs, MOT prep. Apprentice served Triumph Specialist for 40 years and home of Maverick Triumph.PM for more info or quotes.


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 Post subject: Okay....
PostPosted: Sun Oct 29, 2017 12:56 pm 
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Such a question had been posted in the following thread, but so far there has been no response:

Board index » The Triumph Dolomite Club » Dolomite-related [Start here!] » MGF WHEELS

viewtopic.php?f=4&t=33153

I am not trying to fill the wheel arches, but ensure appropriate clearances between the wheel & tyre assembly and the adjacent wheel-arches & suspension components, under all conceivable driving conditions. Using 185/65 R15 tyres, is predicted to give the overall effective engine gearing I seek, whilst also employing 65-Series tyres for minimum rolling resistance, as well as good overall handing and ride comfort.
Fair enough.

A point to consider is that the body shells are not all identical.....
back in the days of the DSR, fitting 185/60 tyres to Sprints was common, but the results were variable, some rubbed on the inside, others did not.




Ian.

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 Post subject: Re: Okay....
PostPosted: Sun Oct 29, 2017 8:49 pm 
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A point to consider is that the body shells are not all identical.....
back in the days of the DSR, fitting 185/60 tyres to Sprints was common, but the results were variable, some rubbed on the inside, others did not.




Ian.
Wouldn't that be more to do with suspension and bushes rather than the bodyshell?

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 Post subject: wheels and tyres
PostPosted: Mon Oct 30, 2017 6:46 am 
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I have the 15" MGF alloys with 185/55/15 tyres, and I had to trim the rear arches back to nothing.

185/65/15 tyres are huge in comparison, 1 1/2" larger diameter. That will lift the car 3/4" off the road! To change gearing surely a diff swap is a better idea??

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Brighton
Driving Toledo fitted with slant 4, sprint OD box and axle. Needs fettling!


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 Post subject: Re: wheels and tyres
PostPosted: Mon Oct 30, 2017 4:24 pm 
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Location: Canvey Island, Essex
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I have the 15" MGF alloys with 185/55/15 tyres, and I had to trim the rear arches back to nothing.

185/65/15 tyres are huge in comparison, 1 1/2" larger diameter. That will lift the car 3/4" off the road! To change gearing surely a diff swap is a better idea??
185/65 R15 are of similar external diameter to what I originally had on the car from mid-1975 to 1987, which were 175 R13 tyres (i.e. 175/80 R13 ~ 175/83 R13) on 5½ x 13 Cosmic alloy wheels with 21 mm offset.

Finding a suitable rear axle from a second-hand Triumph 1500TC, Triumph Dolomite 1500 or 1500HL, and having couriered to canvey Island, Essex, is likely to be less straight forward than substituting 5½ x 15 inch alloy wheels (31 mm offset) with 185/65 R15 tyres. Besides that, I like the extra ground clearance!

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PostPosted: Mon Oct 30, 2017 4:45 pm 
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I have a good 4.11 toledo axle if you want it!! As a freebie, and could possibly deliver to Clacton in a couple of weeks.

I also have some MGF wheels available at very reasonable cost, no tyres though. Well, some "getting old" michelins, but they really want taking off.

I am still thinking about what tyres to use. The wife likes the MGF alloys, I like the 13" 5 1/2 steels. I suspect we may meet in the middle on the 14" steels off a montego/MGF spares. Probably 175/65 tyres. Maybe.

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Clive Senior
Brighton
Driving Toledo fitted with slant 4, sprint OD box and axle. Needs fettling!


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 Post subject: Re: wheels and tyres
PostPosted: Mon Oct 30, 2017 10:40 pm 
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TDC Shropshire Area Organiser

Joined: Sun Aug 21, 2011 4:12 pm
Posts: 4275
Location: Highley, Shropshire
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I have the 15" MGF alloys with 185/55/15 tyres, and I had to trim the rear arches back to nothing.

185/65/15 tyres are huge in comparison, 1 1/2" larger diameter. That will lift the car 3/4" off the road! To change gearing surely a diff swap is a better idea??
185/65 R15 are of similar external diameter to what I originally had on the car from mid-1975 to 1987, which were 175 R13 tyres (i.e. 175/80 R13 ~ 175/83 R13) on 5½ x 13 Cosmic alloy wheels with 21 mm offset.

Finding a suitable rear axle from a second-hand Triumph 1500TC, Triumph Dolomite 1500 or 1500HL, and having couriered to canvey Island, Essex, is likely to be less straight forward than substituting 5½ x 15 inch alloy wheels (31 mm offset) with 185/65 R15 tyres. Besides that, I like the extra ground clearance!
You would only need the diff shipping as a taller diff will fit the Toledo axle case and half shafts. I have one in a 77 1500HL I'm currently breaking (presumably a 3.89 though i've not checked the code) It's gotta be cheaper and easier than all this faffing with wheels and the cost of new 15" tyres.

Steve

_________________
2 door '73 Toledo with Vauxhall Carlton engine OWF 797M (The Carledo)
Vermillion (and Rust) Sprint Auto EGP 247T (The Dolomega)
'91 Cavalier 2ltr 8v auto
'95 Cavalier 2ltr 16v auto
Spectrum Auto Services, Servicing, Repairs, MOT prep. Apprentice served Triumph Specialist for 40 years and home of Maverick Triumph.PM for more info or quotes.


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