No one can give a best pressure to run with, as everyone weighs and rides different, it comes down to experience/trial & error for each individual. Zhongyas are the best for cags and without a doubt pmt's are best for higher performance pocket bikes.
i lernt the hard way.Got a heap of hua-jian tyers cheap.Only lasts for 2x 10 lap races,Rating is 0 out of ten i reckon.Zyongs are the better ones for me so far.Havent tried any others.but will be soon.And yes pressure is a hard thing to work out
__________________
6 bikes.
-----------
one with RD top end kit.14/14 carby,carbon 3 stage fiber reeds,zx1 pipe
one with 55cc chainsaw top end, PBU pipe
ZX1 Taipan. PBU pipe,banshee engine.
Polini clutch bell .
2 X Banshees SHO
1 fitted with polini clutch,black widow triple stage reeds
19mm del rep carby,,billet head,billet reed cage, 6/76 gearing,sava tyres
1 fitted with 50cc BZM blata engine ,21mm walbro and BZM gold crank ( dangerous now:o)
1 blata SQ roller only SRT Spooge Racing Team NTH Division
ive got zhonas and run 22psi im about 50 kg on my standard cag raced the same tyres for ages and just started to slide at the finalls so go zhona for chinese tyres
I have been reading your posts on tyre pressure with some interest. I race full size motorcycles as well as a bizeta powered polini rep. When talking to the 125 gp guys at the recent hartwell motorcycle championships i recieved the most valuable piece of advice.
Bassically the advice was as follows: "run tyres as soft as you can get away with." to determine this:
1. messure the tyre pressure when the tyre is cold
2. use tyre until the tyre is at full operating temperature (2-3 laps)
3. messure tyre pressure while tyre is hot
4. If the gain in tyre pressure is greater than 2 pounds the tyre pressure was too low. If the tyre is unable to gain 1 pound the tyre pressure is too high.
For a zongya slick, with me (65 kg) riding, optimum starting pressure was 14.5-16 psi, far lower than i expected. When i tried this, the bike was stable and cornered hard all the way to the edge of the tyre. It was such a success that i now use the method on my full size race bike, now running 13psi it has never handled better!
This results because more traction achieved is when the traction patch is of a greater area.
__________________
Trying to get more people to pocket bike events held around Tasmania
It is well worth a try. When i first got on the minimoto i thought running the tyres at 24-25psi would be the go. I concluded that pocket bikes were horrible things after the first day at a kart-track because it was nervous and chattery mid-corner which was un-nerving to say the least. Since lowering pressures my opinion has reversed.
These types of higher pressures may apply to an italian PMT with a soft compound, but i have found that chinese tyres only build temperature at relatively low pressures due to their harder compounds with relatively high hysterises.
__________________
Trying to get more people to pocket bike events held around Tasmania
is a vee rubber any diferent? as in chinise origin or euro, i havent realy heard mutch about savas and vee rubbers only that viper sells the vees and ozminimoto sells the savas...
__________________
Blata rep Watercooled
Triple stage reeds,19mm dell
Reed Spacer,Gloss white
Senior Stock Watercooled
South Morang & Port Mel
Cag in the making
I'm pretty new to pocket bikes, but it is good to read all the advice here, thanks for taking the time guys. Along with tyres comes wheels, so..
3 queries for you:
1. Does anyone ever worry about balancing pocket bike wheels?
2. For full size bikes, you can gain quite a handling advantage if you start to alter sprung vs unsprung mass, that is, the weight of the wheels etc vs the weight of the bike that is carried by the suspension. While most of our PB's dont have suspension, has anyone ever tried changing to lighter wheels, and what difference did it make? I guess that we don't have significant gyroscopic force, because my cag will change direction incredibly easily, so i guess that lighter wheels wont make a big diff, apart from simply reducing total mass.
3. 250cc bikes have narrower tyres than bigger bikes, the latter of which have vastly more power, and need the rubber on the road to stop wheel spin due to torque. But PB's seem to be more like 250cc bikes, in that you want to maintain high corner speed (unless you blokes are laying out fat black lines on your corner exits?). But when I look at PB tyres, they are all quite fat. Anyone ever tried thinner tyres and gone faster?
Linear Mode
