Will chip in here with ancient second hand contis were DESIGNED to have a greater slip angle for the rear , and would swap ends before TT100s , providing flying Lessons .
Actually it was a lower co efficent of friction , at the rear .
Most stimulateing and thought provoking at 60 mph when your three feet up and the bike is horizontal , beside you . Not a lot of point hanging onto the bars m as its a bit far gone .
The TRIGONIC Tyre series , KR etc racing tyres , and the K 81 TT100 in the sub 100 H.P. days , were designed to have a lower co efficent of DRAG , upright .
narrower contact patch gave less rolling resistance , and adequate traction upright under acceleration and braking .
Greatly incresed area in contact , cranked over . Thus superb braking ( if the chassis isnt shot ) and acceleration IN the Bends .
But a rear had around 5.000 life if you wanted tread under you .
Later 18 rears were common for the wider 4.25 tread , used by Rawlins & the Late 70s PR Norvil on the track . Common on T140s of course .
The English Motorcyclist Illustrated had a series with Ray knight and His P.R. Thruxton 74 750 Bonneville .
Most had gone to 4.10 19 K81 fronts as more docille to steer than the short sidewall stiffrace carcass KR76 3.00 x 19 . which had the same breadth side tread but narrower uypright contact patch .
A British Lap Record was set on a Jota with Roadrunners surformed to Trigonic ( Akin ) X section . , So , If you ' run the bends ' with the footrests dragging , Go for it .
The KR carcasses were said to be to stiff for the rear on Triumphs ( Non Oil Toob , at least ) introducing rear steer in a non rider initiated manner .
Then Michlin PZ2s came about , and dual compound semi trigonic Perrelli Phantoms . Both Sticky ( on the track ) but even shorter lived .
Then , by 1980 , wonder of wonders , American Dual Compound stiff Casing K81Rs , so your Goldwing wouldnt pop em at 100 across death valley . After All , you wouldnt prolong the agony of the crossing.
So were Told .
However , If extant , the US built ' R ' K81 TT100 Carcass was top tecnology but unfavoured amoung the then current rice burners , on the track .
Their style , was not so much ' run the curves ' as Point and Squirt . Incidently AMA Superbikes had gone to the then new wondertyre SLICKS ( around 1980 )
Late Redline Avon Roadrunners had KR 76 style tread , on a large X sec. semi ' hard ' carcass , and were hot shit , fopr a street tyre . good Water Dispersion & High tech Carcass & tread .
Which brings us to . . . Central rain Grove TYRES tend to tramline , camber steer , and get caught in tram & train tracks . But if your roads lack straights & rail tracks , and are well maintained ,
tt100s would be good value , more so with a 4.25 18 ( same circumferance as 4.10 19 ) REAR . 18 frontsthen were common . SS Dukes , Laverdas etc . The Later often with TT100s on a 500 Lb Motorcycle.
The worlds Fastest Stock , 142 odd .
The R Carcasis vastly racier , being less bump absobing . Thus Scratching AND Touring . A Tec Rep should know the current status . KR 76s ( Malcolm Uphills 1970 I.o.M. triple - Pre Disc ) AND the F-750s
Par Tick U Lar Ly . were available again , for a time . Originally one of three was for Hot Days in S. Africa , and is a spot to striff for cloudy days , let alone the damp . Other two were UK summer & winter .
If ytou want to grasp pine branches in your teeth , and wet your pants , the 70s Pirrelli Dirt Track Tyres will accomodate those desires . Soft Track US TT / Oval tyre .
the KR 70 was leathal with the TT100 rear on a trident , leant , if you had call to pull up hasteilly .
however , this , the std ' hard / Groove ' US TT / Oval track tyre was prewtty good for hooning rather than scratching , are not low profile , and current ( 3.25 19 & 4.00 eighteen or 3.5 19 , but NOT on the BACK,
THANKYOU , would be excellent all road ( Wot Road ? ! I S D T type all round with good grip and drive on gravle , dirt , and Tarmac , But tyre NOT trigonic & dont have twivce as much rubber down LEANT , as
Upright - in fact the opposite . But Like a hard chine yacht have good lateral grip leant on unsealed surfaces , good predictability , and a degree of throttle steer / Drift at MODERATE leans , on tarmac .
Kissing the rests is about the limit , on sealed roads anyway , but upright seated vast reasurance IF you ride with a degree of reserve rather than holding on by the skin of your teeth ,
a KR 76 front & 4.25 K81 rear , youd want there . And youd be dicarding surpluss electrics like starters & indicators and overweight silencers .
I guessyour not 18 and determined to discard Hondas aft .
Overtyreing itll stogy up things , tyres should have a bit of tread down , leant . The I.o.M. Guage was 50 ? degrees lean clearance , rider aboard , I think , to accomodate the odd whump well leant ,
so as not to lever the tyres off with the fairing , youll see they all kissed , full lean , on Triumphs there .
so Study some olde I.o.M. Works Entry pictures , and the R 3 I.o.M & T150 Marshals bikes . THAT should be adequate , with half a dozen good rocks in your top pocket , to ward off tin tops intent on your line .
Also The then 7 current F 750 triples , perhaps . a 18 rear two up and touring will give greater load rating and leant , clearance , as wider , for the Same Height .
COR .
