10-09-2017, 07:29 PM
Hi,
I run a Type 65 with four speed CR gearbox ( only CR between third and fourth )
At Wiscombe with the VSCC I run either 3.25 x 19" dunlop bike tyres or 3.50 x 19" avon sm
With the MGCC at Wiscombe I run 3.25 x 17" avon sm on the rear and gain about 4 seconds in the dry.
The gain is due to being able to hold third gear through the Esses with the 17" and not losing speed just before Martini.
With the 19" I go between second and third through the Esses, 4 gear changes and the engine bogs in third before Martini.
The 17" rears are good through the Esses into second round Sawbench and third all the way up to Martini saving four or five gearchanges.
As It was really wet yesterday 9/9/17 I just ran with 3.50 x 19" Wheelspin off the line round Wis, Sawbench and Martini.
At Prescott the 3.50 x 19" avon were almost perfect for ratios.
For the Type 65 swapping rear wheels depending on venue works ( For VSCC events I am limited to what I can use within my class rules )
Its all trial and error, given complete freedom from rules you would have a set of different wheels for each venue to get the engine in its sweet spot.
Cheers Richard
I run a Type 65 with four speed CR gearbox ( only CR between third and fourth )
At Wiscombe with the VSCC I run either 3.25 x 19" dunlop bike tyres or 3.50 x 19" avon sm
With the MGCC at Wiscombe I run 3.25 x 17" avon sm on the rear and gain about 4 seconds in the dry.
The gain is due to being able to hold third gear through the Esses with the 17" and not losing speed just before Martini.
With the 19" I go between second and third through the Esses, 4 gear changes and the engine bogs in third before Martini.
The 17" rears are good through the Esses into second round Sawbench and third all the way up to Martini saving four or five gearchanges.
As It was really wet yesterday 9/9/17 I just ran with 3.50 x 19" Wheelspin off the line round Wis, Sawbench and Martini.
At Prescott the 3.50 x 19" avon were almost perfect for ratios.
For the Type 65 swapping rear wheels depending on venue works ( For VSCC events I am limited to what I can use within my class rules )
Its all trial and error, given complete freedom from rules you would have a set of different wheels for each venue to get the engine in its sweet spot.
Cheers Richard