saver spare wheels for V8s
David Waterton (Tornado
Red 4330) from Buckinghamshire acquired a beautiful V8 Roadster in 2005 but after
the Factory MGBGTV8 he had owned for many years, found space tight in the boot.
So he set about finding a good space saver tyre and wheel combination. (Jan
With boot capacity being at a premium in a V8 Roadster when
the full size steel/alloy wheel is in place, I set about finding a suitable space
saver spare wheel as an alternative. Although the speed limit for these wheel
and tyre combinations is 50 mph (80 kph), I have had first hand experience of
driving my non MG 'everyday' car, fully loaded, for over 300 miles on such a wheel
without incident. Casting my mind back to a Silverstone International weekend
meeting in the 1980s, I remembered a conversation with a Saab 900 owner whose
'weekend' car was a MGBGTV8. He mentioned that his Saab space saver was an exact
fit for the four stud V8 hub.
I discovered the hard way
that the classic Saab 900 model had two different sized four stud hubs fitted
during its long production run
the 20 year gap, I started to search for a wheel at a local Saab breaker's yard.
I discovered the hard way that the 'classic' 900 model had two different sized
four stud hubs fitted during its long production run. The later, and more readily
available, space saver wheel does not fit a V8 hub. The correct match, for the
MGB hub, appears to be for the pre -1987 Saab Classic model. This part
is also no longer available from Saab dealers but you will find the part number
is stamped on the centre of the wheel near the stud holes as 8242088 together
with the wheel size 4Jx15.
obtained a wheel rim from a breaker's yard, the next task was to check on tyre
availability. There were various sizes of Michelin space saver tyres fitted during
the production cycle of this 15 inch rim, none of which are available today. The
fact that the standard V8 rim has a 14 inch diameter is of little concern, as
it is the
Space saver wheel fitted in a neatly trimmed V8 Roadster boot. (Photo:
rolling circumference/revolutions per mile and load rating that are the important
factors. There are websites where you can check the rolling circumference information.
V8 Roadster is fitted with 195/60R15 tyres for which the circumference is 76.1
inches and the revolutions per mile are 833. The Factory fitted MGBGTV8 tyres
are 175/80R14 with a circumference of 78.6 inches and the revolutions per mile
are 806. It appears that in the UK, Continental and Pirelli space saver tyres
are most easily available. I chose a Continental T125/80R15 95M tyre with
a circumference of 71.9 inches and revolutions per mile = 882. This is -5.5% compared
with my current tyres. That variation is, in my opinion, an acceptable trade off
for boot space gained against a small speedometer error. After all it is only
a temporary spare designed to get you home or to the nearest tyre repairer or
final modification is to secure the thinner space saver wheel to the boot floor.
To do this you either have to obtain a spare wheel retaining bolt, as fitted to
the MGBGTV8, and then reduce its length so as not to puncture the top of the fuel
tank, or go to your local bolt specialist supplier and purchase the correct length
item and a large flat steel washer to hold your new spare wheel in place. The
net result is considerably more room in the boot, enough for a good sized kit
bag and various other items which can be stowed around the edge of the tyre.