tr7triumph.com

Posted: **18 Jul 2012 18:53**

Hi there,

I've already owned up - I don't own a TR7.
I have however just bought my first Triumph - a Dolomite.
The reason I joined this forum is to find out which TR7 parts are interchangeable with the Dolomite equivalent. I'm thinking mostly of drive-train and suspension parts here as I intend to change the engine in my car eventually.

But my first specific question is: What are the dimensions of TR7 steel wheels as listed on the rimmer bros website? What size of tire is fitted to them on a TR7, and does anyone have experience of them on a Dolomite?

Hope someone can help,
I'll be back with more question, I'm sure!

Thanks
Dave

Posted: **18 Jul 2012 19:14**

HI Dave & welcome to the forum!

The early 4 speed TR7 did share some drive train parts with the Dolomite range, but I could not tell you with any certainty which parts.

The TR7 steel wheels are 13" with 5.5J rims, and the bolt circle (PCD) is 95.25. I am sure I have seen a Dolomite with TR7 alloy wheels fitted, these had the same dimensions. Early cars had 175/70 x 13" tyres, later cars had 185/70 x 13" tyres.

Tony

1981 TR7 FHC Cavalry Blue
1980 TR7V8 DHC Jaguar Regency Red - sadly sold!
1977 TR8 FHC EFI Factory development car Inca Yellow

Posted: **18 Jul 2012 19:28**

The TR7 steel wheels are 5,5 x 13" with an offset of 25mm.
But the Dolomite has 7/16" wheel studs were the TR7 uses M12

The engine is interchangeable although youâ€™ll probably have to change the set up (needles) of the carburettors, due to the Dolly's rather restrictive exhaust manifold.
The 4-speed gear box is also more or less the same.
In theory the 5-speed gearbox can be fitted to a Dolly but I don't know if there's enough room in the transmission tunnel.

From the suspension there is not much you can use.
With McPherson struts the front is completely different ...

The original rear suspension from the (4-speed) TR7 was based on the Dolomite, but the mounting points from the TR7 rear axle are different ...

You can only use the CWP assembly.

<center>

1980 TR7 DHC (my first car, now restored and back on the road)
1981 TR7 FHC Sprint (better known as 't Kreng)
[url="http://www.tr7beans.blogspot.com/"]My full Weblog[/url]</center>

Posted: **19 Jul 2012 05:51**

Hi Dave,
Sorry Bean's is wrong on the gear box issue, the TR7 4 speed is a
single rail spitfire box, the dolomite uses the bigger box
from TR6, Stag, 2000/2.5 and most have O/D but the dolomite has
a longer input shaft as the sprint has a bellhousing
spacer/adapter plate mainly to move the starter to the left
hand side.
I would stick with the sprint box or you might be able to fit a
5 speed with some adjustment, but the 4 speed is far too weak.

Good luck. Scott.

Posted: **19 Jul 2012 06:02**

Back in the mists of time my dad bought his new TR7 with alloy wheels and promptly bought some aftermarket alloys and the TR7 alloys went onto his Dolomite 1850HL, so presumably you should have no issues with the 7`s steel wheels.

1980 Persian Aqua DHC

Posted: **19 Jul 2012 07:13**

Sorry trsforever is wrong regarding the four speed box. The four speed TR7 components are used in uprated Spitfires to take them up to around 200bhp. A lot us make this mistake about the four speed TR7 but when properly set up it is a far more satisfying road car. It may not be as good a car overall but for our British country roads it suits them perfectly. (Note: I said "when properly set up" just in case I start an argument; the cars were rarely built properly at the factory.)

The wheels are the same.

<center>[url="http://www.triumphdvd.co.uk"]Triumph TR7 and other car documentaries on DVD here[/url]</center>

Posted: **19 Jul 2012 07:20**

Another thing that the Dolomite & TR7 has in common: You can fit a V8 in it. [:p]

The map: http://tinyurl.com/wedgemap . The blog: http://www.forum.triumphtr7.com/topic.asp?TOPIC_ID=8548

Posted: **19 Jul 2012 08:40**

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by trsforever

... the TR7 4 speed is a
single rail spitfire box, the dolomite uses the bigger box
from TR6, Stag, 2000/2.5 and most have O/D but the dolomite has
a longer input shaft as the sprint has a bellhousing
spacer/adapter plate mainly to move the starter to the left
hand side. ... <hr height="1" noshade id="quote"></blockquote id="quote">
It looks like you are referring to the Dolly Sprint 'box which is completely different.

I was referring to the 4-speed Dolly 1850/spitfire variant, of ehich there are several flavours available ...

1980 TR7 DHC (my first car, now restored and back on the road)
1981 TR7 FHC Sprint (better known as 't Kreng)
[url="http://www.tr7beans.blogspot.com/"]My full Weblog[/url]</center>

Posted: **20 Jul 2012 17:39**

Ok,

thanks very much for the replies.
Good news, I reckon. I'll be ordering some tr steels and using my own wheel nuts by the sound of it. I just wanted to get a bigger footprint without using sprint wheels.

Will post some photos once they're on. It might be a while, though. we've just bought our first house etc etc...

Ta

Posted: **20 Jul 2012 20:34**

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by DaveyP

Hi there,

I've already owned up - I don't own a TR7.
I have however just bought my first Triumph - a Dolomite.<hr height="1" noshade id="quote"></blockquote id="quote">A good start, although I would say that as my first Triumph was a Dolomite 1850HL [:)]

In the end, I fitted a TR7 engine in the Dolomite - I even used the TR7 airbox. Basically, I made it a Dolomite 2000HL - it had around 90 bhp at the wheels.

Posted: **20 Jul 2012 23:44**

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by DaveyP

... I'll be ordering some tr steels ... <hr height="1" noshade id="quote"></blockquote id="quote">
Check the offset before ordering, Dolomite doesn't have much room for wider wheels tyres in the arches.
I believe the offset for the Dolly wheels is 35mm compared to 25mm for the TR7.

<center>

1980 TR7 DHC (my first car, now restored and back on the road)
1981 TR7 FHC Sprint (better known as 't Kreng)
[url="http://www.tr7beans.blogspot.com/"]My full Weblog[/url]</center>

Posted: **22 Jul 2012 16:21**

Hi beans.

As I understand it, that means that the distance from the centreline of the wheel to the mounting surface is less on a tr than on a dolomite.
So a tr wheel is likely to sit too far out rather than too far in?

Probably not the technical way of putting it...

tr7triumph.com

Hello from a Dolomite owner.

Hello from a Dolomite owner.