Race Tyres .

just spotted this , the olde grand Prix / F 750 tyres , still available presumeably . the renouned ' Trigonics ' predecessors ( some ) of the TT100 / K81 .

http://racedunlop.com/classic.php



Size Tread Pattern inch
rim inch
rim range Press/Bar mm/in. width mm/in. diam
275/375-18 F/R KR825 2.15 1.85 - 2.15 1.6 - 1.8 95 / 3.74 600 / 23.62
350/325-18 /F KR124A 2.5 2.5 2.0 - 2.3 110 / 4.33 634 / 24.96
350-18 F/R KR124 2.15 2.15 - 2.50 2.2 102 / 4.02 638 / 25.12
375/500-18 /R KR164 3 3 2.2 - 2.3 135 / 5.32 643 / 25.31
300-19 /F KR76 1.85 1.8 - 2.0 2.0 93 / 3.66 657 / 25.87
350-19 /R KR73 2.15 2.15 1.8 2.0 106 / 4.17 678 / 26.69

Avon also offers some sweet non-DOT/AHRMA "tyres." I like the racing AM18s (in 19" and 18") and AM23s (in 18"). If you want to run a wide Avon on the rear, look for the VB designation, as distinguished from the V designation. The VBs are wide tires engineered for "class limited" narrow rims. As with all things "racing" they are expensive but sometimes I find them at prices close to reasonable.

Everyone would love non DOT race tires though it'd be like wiping your butt with cash d/t the soft compound wear down unless getting as much as can away form the center. I wish we had a source of used race tires like the balloon bikes do. Race tires don't wear out the centers just feather off the very edges some that sill have good grip life left. Race tires are more puncture prone too.

hobot said:

Everyone would love non DOT race tires though it'd be like wiping your butt with cash d/t the soft compound wear down unless getting as much as can away form the center. I wish we had a source of used race tires like the balloon bikes do. Race tires don't wear out the centers just feather off the very edges some that sill have good grip life left. Race tires are more puncture prone too.

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Not sure about this. Race tyres go off with heat cycles. (The Avons do anyway) I throw mine away after about 25 cycles. The tread still looks fine.

Otherwise they can become very unpredictable. Yes it is rather expensive!!

Yeah everyone says/thinks that used heat cycled race tires are dangerous in public since the racers are tossing them out d/t lessened edge grip but the fact is even cold they exceed DOT tire traction and just get better as warm as ya can get them in public use but of course not as good a fresh expensive race tires ya can't get hot enough for for full on edge traction in public. The other fact of the mater is very very few riders or street bikes can get far enough over under power to matter to even get to the tread area the racers have abraded to melted down somewhat harder less grippy. When I fit a used race tire and ride normally, that is only leaning as much as needed and using some engine drag to slow I only get maybe 2000 miles before center cords show but on my SV650 and Peel there's another 1000 miles extra on each side if confident of farl over traction with some power on. Used race tires only have the far edges degraded with almost pristine new centers so unless you can match the lean and power of full on race use your fears of used race tires is unfounded. Best thing for crossing THE Gravel is pure soft race slick as ya can't dig into Gravel path hard base only scratch surface up like pavement so the soft compound grips the pebbles in place to act like tracts on tractor tires. i've tried to get a line on used race tires in our sizes going up and down pit row pestering racers but most of them have street bikes they can fit their toss offs on so they are getting the extra fun mileage themselves. On SuVee I run $250 rears gotten for $50 and get most of 4000 miles out of them if being careful not to ride pure upright except when necessary or center wears out under 2000 miles but under a 1000 if accelerating much upright and using engine drag to slow. When I first fitted non DOT Perillii race tires on SuVee and leaning what they could do I only got about 1000 miles before cords showed so wasted over $300 in about a week. They transformed THE Gravel crossing "security" so much though I will never buy another DOT tire if I can help it. Last batch I got for SuVeee were 4 tires for ~$200 so using them up under 3000 miles don't hurt as much. Of course race slicks suck on grass and wet roads.

Many years ago a friend went racing as a sidecar passenger in Europe with Orrie Salter - one of the fast guys with a 500cc Rennsport BMW. He befriended Trevor Pound, one of our better riders. When Trevor crashed, my friend helped him get back to Australia. I was visiting him one day and he had a stack of secondhand tyres - ex Trevor Pound. He offered to sell a pair to me. I refused them, as I did not know where they had come from, and did not really know who Trevor Pound really was and what he had done. At the time I was racing on rock hard Dunlop T1 compound triangulars which did not grip unless they were run at very low pressure and got very hot. I still think about Trevor Pound's old tyres - they were probably the latest compounds being used in Europe at that time. The tyres on my Seeley 850 are about 13 years old, and I still use them - carefully for the first lap.

I have scads of take-offs sitting in the corner of the shop. Some of these are quite good, as we get a little fussy with keeping our race bikes' tyres current.


I have several:

Dunlop KR825 (80/80 x 18, soft compound)
Dunlop KR124a (110/80 x 18, hard compound)
Dunlop KR164 (125/80 x 18, medium and hard compounds)
Dunlop KR145 (125/80 x 18, hard compound)
Avon AM22 (110/80 x 18 - front (soft) and rear (hard) compound)


Anyone interested can PM me.

I'll take these please.
Dunlop KR164 (125/80 x 18, medium and hard compounds)
Dunlop KR145 (125/80 x 18, hard compound)
Avon AM22 (110/80 x 18 - front (soft) and rear (hard) compound)

Btw by far the most beneficial thing about soft race compound slicks to me is how much more secure the grip is on THE Gravel, which has hard base with loose layer, tire grooves or knobs can't dig into the hard tack and grrooves are knobs are all the same on marbles but soft rubber grabs the pebbles/stones from rolling on tire and uses them as tire texture thrusters. For a sense of how soft race compound can be stone cold - when I leave on my SV650 the front tire hold pebbles to scratch loudly on plastic fender for a few miles but on return tires soft enough they don't continue to grip pebbles enough to carry under fender. What ever works on THE Gravel works even better off it to me. I can not get gum balls heat on SuVee race rubber in public but do abrade off what the racers left and then a good bit more. The Ozarks allow this but a city would not be worth shipping to as likely less than 2000 miles before cords and race tires are more prone to puncture. I'm curious to mix/match bias and radials on a Commando but worked a treat on SuVee.

hobot said:

Btw by far the most beneficial thing about soft race compound slicks to me is how much more secure the grip is on THE Gravel, which has hard base with loose layer, tire grooves or knobs can't dig into the hard tack and grrooves are knobs are all the same on marbles but soft rubber grabs the pebbles/stones from rolling on tire and uses them as tire texture thrusters. .

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Im really surprised at this. On a few of our tracks you are on gravel in the pits before you get to the track proper. The gravel makes a hell of a mess of our Avon tyres. When cold and hot. The gravel get thrown up all over the bike everywhere. You must protect the carb inlets. You find gravel around the sparkplugs and need to blow it away before takeing the plug out. And when the tyres are warm the gravel gets almost intruded into the tyre and rips them. You get pieces of gravel forced deep into the tyre. We do all we can to avoid driving through the damn stuff with race compound tyres

Maybe your gravel is more like a sandy dirt track. Ours can have sharp pea metal and larger sized stones.

John

I was wondering what was wrong with our tyres these days ? Thats It . Theyve gone and changed the Colour .

Yep Sir Gravel experienced John that's why I was so pleasantly surprised > only compound softness matters when peas to marbles and arrow heads layer cover a hard smooth surface. I always and will forever respectfully refer to it as "THE Gravel" or other found terms like THE Slutty Shitty Stuff. Arkansas is known for its 'sex rocks' by workers, "Ugh another f--king rock in the way" and varies from fist size to nano dust size that passes k/n type filers like flies through a fence. It THE Gravel is crossed with any spirit tire center wear greatly accelerates as leaning on THE Gravel is bad ju ju. On the other hand by time I reach tarmac the tire surface its a fuzzy new surface.

hobot said:

Yep Sir Gravel experienced John that's why I was so pleasantly surprised > only compound softness matters when peas to marbles and arrow heads layer cover a hard smooth surface. I always and will forever respectfully refer to it as "THE Gravel" or other found terms like THE Slutty Shitty Stuff. Arkansas is known for its 'sex rocks' by workers, "Ugh another f--king rock in the way" and varies from fist size to nano dust size that passes k/n type filers like flies through a fence. It THE Gravel is crossed with any spirit tire center wear greatly accelerates as leaning on THE Gravel is bad ju ju. On the other hand by time I reach tarmac the tire surface its a fuzzy new surface.

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Gravel road - (we also call them metal roads) . I learnt to ride on them.

http://offtracktravel.ca/2012/06/03/how ... w-zealand/

Ugh Johmn, THE GrIT's names sucks everywhere and too often mentioned in reports of going down. I tried a number of tires and pressures on my SV650 and about gave up riding its was so dicey till caved and bought Pirelli Diablo's Corsas and felt the better grip right off. Made it to pavement and rubbed off the new surfaces and heated some on return and tuned to bike handling I really tested the new grip to get crossed up in tights crossed up spun into 90's mph, just twice as so dangerous but pleased to hi heavens till I got home to see tires both easy 1/3 gone. No way can I afford to use up expensive tires so fast and do not consider the 90 mph flat tracker style very fun or exciting or useful for road racing after what Ms Peel can do so tamed down and can get 2000 mile out center and 1000 off each side.

To rub in Peel even more I never got to try her on plain street tires, one I never thought of a Combat as much a go getter just quaint bager so got hardened deep cleated tires and found grip control got better and better at least up to 56 psi in front and 58 in rear. Never did wear rear out and used in on Trixie till it got a blow out and rode home 6 miles making the case damaged and lumpy. Just imagine how fun Peel should be with decent tires.