|The MGA With An Attitude
SUBSTITUTE WHEELS for the MGA Twin Cam - TC-205F
Modified Volvo wheels
For wheels which are much more readily available, consider fitting Volvo rims to the Twin Cam spider. They are a loose fit - maybe 1mm oversize, easily packed with sheet metal prior to welding and not too great a gap to bridge. The wheels to use are Volvo 164 sedan 15" X 5" wide or 165 wagon 15 X 5.5" wide. These are a modern safety style rim with the bead groove for tubeless tyres and therefore do not look entirely original. It may be a bit embarrassing to admit to using Volvo parts on an MGA but it is a convenient source.
On 12/26/2015, Peter Todd in Australia with Twin Cam YD2/2435 wrote:
"Fitting wider rims to my twin cam centres. I bought four Volvo 5.5 inch X 15 inch steel rims. I mounted the Volvo rims in an old 2 metre gap-bed lathe and machined out the large spotwelds holding the rims
onto the centres. The twin cam centres are not welded to the rims but rivetted. The first wheel I linished [ground] the tops off the rivets, but then on the other three, I saved about 1/4 of an hour on each one, by drilling a pilot hole in the centre of each rivet and used a cobalt drill to drill off the heads of the rivets on the rim side of the wheel. I had to cut the twin cam rim off using a 1mm X 125mm cutting wheel on an angle grinder. Cutting across the rim, I did not to have to fully cut through the rim as when the rim thickness got down to about 20 thou, the rim popped apart enabling me to take out the centres without marking the centres with the cutting wheel.
"The problem I now face is how to mount the 5.5 inch rims on the twin cam centres, as the rims are an interference fit on the centres. Do I have to heat the rim as per fitting a flywheel ring gear? or do I bite the bullet and let a roadwheel Specialist finish off the job. I have had twin cam wheels widened by a wheel specialist before but on this car so far I have done everything myself, and would like to continue to do so"!
On 12/26/2015 -0800,Dirk Vanussel wrote:
"Had the same problem with TR wheels. I then took a center and went trough all the wheels I could possibly find at breaker's yards. In the end a Honda (think Accuro) rim fitted. But these are unobtainable to find now. The second set was made with (You will not believe) rear wheels from a Smart! The centers were a loose fit but with a added layer of 1 mm metal it now works perfectly".
On 12/30/2015, Peter Todd wrote:
"Finally finished. Packed the centres in dry ice overnight. They had reduced their diameter
by 1.5 mm the following morning. I could then start the centres into the rims from the inside of the rim. Using a vernier calliper with the depth gauge I was able to gently push the centres in a garage press into the correct position to give me an extra 1/2 inch outside offset. I measured the distance from the outer face of the rim with the rim sitting outer side down through the numerous holes in the centre perimeter on the dining room table. The measurements through the holes to the table top varied by only .43 mm. Centres now welded to the rims.
"Anyone contemplating going down this track using Volvo 5.5 inch rims, be warned – there are
two types of Volvo 5.5 inch rims. The ones with the enormous square spot welds will give you an interference fit with the MG rims. The ones with the large round spot welds will give you an oversize rim, that you may have to use shims to mount the Volvo rim on your Twin cam centres. The easiest route is to use the wheel with the square spot welds holding the Volvo rims to their original centres as they can be more positively located centrally on the Twin cam centres".
On 12/30/2015, Mark Hester wrote:
"I've always been told TR6 rims were used. When my brother did his car a model of 4 wheel drive wheels were used to make his 6 inch rims. They were too wide and much to heavy but did easily take 205 racing tyres.