Using larger tyres at the rear to give the VW longer legs didnt work well. They were 5% bigger circumference. These new Goodrich T/A's are the original tyre size 295/50 r15...the size that GT Falcon guys use. and they now have white wall inserts. The T/A's have their lettering on the walls higher so it doesnt wave the flappers. Eats hills now. will tow better. economy now 26-31 mpg.
The front tyre was a balance.
Originally it uses a 150/80 r16. Harley size M/C tyre. But a few things here. The front was too low to the ground and scraped a lot on driveways. I also wanted the squatted rear look, lower at the rear, higher at the front. I wanted white walls. The guy at Antique tyres Ben (highly recommended) said that there are two tyres of the above size that are white walls. Metzeler and Avon. But M/C tyres on my trike only last 10,000kms. Motorcycle owners have this acceptance that 8,000km from a set of tyres is ok- I dont. So Ben showed me his hot rod. It has cross ply 600-16 tyres and its the only tyre with while wall both sides. It is a massive 3 inches bigger diameter and the tread is much wider.
The rim I have is a 3 inch and I want to upgrade it one day to a 4 or 4.5 inch wide and 80 spokes (double the spokes will match it to the rear spoke wheels better). These size rims allow the cross ply tyre to "crown" in the middle which is a god send because it allows for lighter steering than what it would be (is a little heavier now compared to the M/C tyre) and corners very well. The negative is that it skips when you first take off and have the handlebars turned. You soon adapt. Dont know what its like on the wet yet). Tread is very deep- will last longer.
The trike used to get attention- now its manic. Had one guy hang out a car window on Geelong road with a telephoto lens. Had a bunch of guys pull out their mobile phones for their cameras and looked like the wild west as they drew their weapons. The sad one in Toorak yesterday was an old man who said "I wished I didnt listen to my wife 20 years ago and went and bought one".
As for the heaters Bennie.
They werent as hot as I wanted. So made a number of mods.
- made up a floor out of steel peg board from Bunnings.
This stops hot air going towards the ground and rain/stones from coming up on a dreached/gravel road
- replaced 82 degree thermostat with 88 degrees.
- the digital temperature gauge had me worried in glare as you couldnt read it. So obtained a temperature switch (96 degrees)from Howard Instruments (good web site
http://www.howardinstruments.com.au/ ) and an adapter for the m16x1.5. Hooked it up to a truck reversing alarm from Autobarn under my seat. Temporarily disconnected the thermatic fans and at 2am last night let the motor run. At 95 degrees on the digital guage it woke the town of Strathbogie and as I'd hard wired it...took some time to cut the wire. lol. So no more fear there.
-This morning went for a ride To seymour (45 mins) on the freeway it was a good test. The temp rose to 92 degrees before the thermoes cut in (was 37 degrees up here). Fans stay on till 85 degrees then cut off. Generally it stays at 88 or 89 and goes up only on hills or if I hit 120 kph and speed creeps up on me.
Heaters? bloody great!! the vents stop about half or more of the heat. enough because I have passing air all the time so you dont notice half the heat. In winter they will be great.

[SIGPIC][/SIGPIC]Tweety trike- EA81 (full reco 2014) 32/36 weber, SPFI manifold, 9.5:1 CR, VW auto.