BT003 Type 3 revised front tire test, Thunderhill Raceway Park

//BT003 Type 3 revised front tire test, Thunderhill Raceway Park

BT003 Type 3 revised front tire test, Thunderhill Raceway Park

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Jeff Viets of Viets Performance brought me the new front tire to test. To the eye, there’s not much to see until you put the tire on the rim and inflate it and suddenly the change in roll profile becomes immediately obvious.

Putting my 09 R1 on the track and scrubbing the tire in gave some instant and qualitative feed back. The roll profile is very reminiscent of the R10 and the bike leaned in with very little bar pressure indeed. Similarly, the bike flicked side to side very easily too taking a lot of “body english” out of the equation making the bike much easier to flick through combination corner sequences. Starting at the tire at 29psi cold saw a gain of 5psi after 12 laps, so pressure was right on the money based on lap times, ambient and track temps.

In pushing the tire harder with braking, there was very little carcass deformation under severe straight line braking and excellent feedback with aggressive trail braking giving me plenty of confidence in charging the corners and using the front tire to scrub speed. So much so in fact that I had no problem in some coaching sessions of using the front tire by itself to assist slowing the bike down. To me, this is a vast improvement on the old front and what I would have only considered as an excellent track day tire has now been elevated to the race level as an option.

Front tire wear pictures are after 582 miles at Thunderhill Raceway Park (left biased track), and rear tire analysis follows:-

Type 2 Rear

We all know how expensive tires are, so for those striving for better lap times most of the improvement comes from earlier and confident acceleration. That means softer tires for better drive grip and we end up buying 2 rear tires to 1 front. Therefore, rear tire longevity without sacrificing grip is a compromise that we all appreciate both at track days and for race practice sessions. The Type 2 rear tire has its focus on longevity, but don’t think it is a bowling ball and hard as a brick.

I started with a higher cold pressure of 27psi with a specific goal of getting longevity. Pressure gain was averaging 5psi, and drive grip showed no hint of slip or spin under any throttle openings, to the tire pressure was never changed from that base pressure. The drive grip was excellent until about 300 miles in and then the miniscule slide became very predictable and at the 500 mile mark quite enjoyable.

At 582 miles on a very high speed track with long duration corners featuring hard acceleration, the tire gave almost 3 times the mileage of the R10 I tested (but that’s a race tire so that isn’t an apples to apples comparison). I’d certainly use this rear tire to race on as a club racer looking to gain experience while managing expenses.


Videos links:

Part 1:

Part 2:

Part 3:

By |2018-01-27T18:44:23+00:00January 4th, 2018|Categories: Tires|0 Comments

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