RG150 racing questions

[smithmZXR]

HI,

I am quite new to RG150 racing. I currently have tubeless tyres on the bike and I am wondering what pressure they should be at? Also whats the best sprocket (front and rear) set for Ruapuna? Cheers!

[quickbuck]

HI,

I am quite new to RG150 racing. I currently have tubeless tyres on the bike and I am wondering what pressure they should be at? Also whats the best sprocket (front and rear) set for Ruapuna? Cheers!

Firstly, What brand of tyre are you running? They are different....
Rule of thumb is a 4 psi gain from cold to hot temperature.

The best sprockets are the ones that let you get to the redline down the straight just as you brake for turn 1.
It will be different from rider to rider as you will exit the last corner at different speeds than somebody who is not new to 150 racing....

Oh, you may have to compromise sprockets depending on weight of rider, and sometimes to make it so you don't have to change gears in an annoying corner....

Welcome to the world of racing small bikes.
You will have a blast....

Caution: The sport is highly addictive.......

[steveyb]

Contact Motorcycling Canterbury. They have all the info you need to know about racing RG150's.
Don't waste your time asking questions here.

[quickbuck]

Contact Motorcycling Canterbury. They have all the info you need to know about racing RG150's.
Don't waste your time asking questions here.

Come on now Steve, I was trying to be helpful

You have a point though, and at best this thread will be kept at the top by a few people ending up having their own conversation.......

[gammaguy]

As far as I know the RG150 is meant to have tubed tyres,according to my manuals at least.

Running tubeless tyres on tube type rims will end in tears,and tears(to your leathers)

[Mort]

My son runs Bridgestone BT39s on his RG. We run them at about 24psi.

[jasonu]

Get rid of the Rg150 and go Bucket Racing. It is THE premier rider and machine development class in NZ if not the world.

[steveyb]

See what I mean?.......

[Billy]

See what I mean?.......

Yip....Didnt see that coming,Good to see nothings changed

[budda]

Yip....Didnt see that coming,Good to see nothings changed

That's a worrying lack of foresight right there Sir ...... less coffee and more grog should sort it

[quickbuck]

Get rid of the Rg150 and go Bucket Racing. It is THE premier rider and machine development class in NZ if not the world.

IF he wanted to do that then he would have bought a Bucket and posted here: http://www.kiwibiker.co.nz/forums/fo...php/91-Buckets

[jasonu]

IF he wanted to do that then he would have bought a Bucket and posted here: http://www.kiwibiker.co.nz/forums/fo...php/91-Buckets

Maybe so. Or maybe he doesn't know about Buckets.
Just tryin to help a nigga out...

[oyster]

rg standard gearing is 16 / 48 (A few had 47 for some reason tho) if your under 80kg, the bike is in good order and you're riding well, then 17 / 48 is perfect for all three SI circuits. If you venture up to Manfeild, fit a 16 for this little stop/start track unless it's windy. Any wind direction and it'll blow
you off Higgins or down the straight to an overrev situation. Fine for a while, but this halves the crank/piston life. The rg rims don't have a "safety bead" so they need a tube at all times. 26 -28psi mostly suits all tyre types allowed. Replace the tube when you replace the tyre, they chafe quite a bit so not worth the risk of running them too long. And yes, plenty of people at MCI events will help with a ton of experience. Ride safely, better lap times will follow.

[Mort]

The rg rims don't have a "safety bead" so they need a tube at all times. 26 -28psi mostly suits all tyre types allowed. Replace the tube when you replace the tyre, they chafe quite a bit so not worth the risk of running them too long.

Oyster - can you give some more info on the inner tube - my son's bike doesn't have them - is that a safety issue I should look at ?

[steveyb]

In case Oyster doesn't answer, not sure if he visits here so much these days, and because it is a bit of a safety issue:
The 'safety bead' mentioned is found on wheels made for tubeless tyre fitment.
On the inside of the rim there are three parts: the well, the horizontal part of the flange and the vertical part of the flange right at the outside.
On the horizontal part of the flange just before it dives into the well, there is a raised hump, like a speed hump.
This is the safety bead and is designed to prevent the tyre bead sliding back into the well of the rim and thereby deflating.
A wheel not designed for tubeless tyre fitment does not have this raised bead and without a tube, it is possible, not likely, but possible for the tyre bead to slide across the flange and into the well and go down.
The tube prevents this happening.
A picture is worth a thousand words. Pictures attached is of a tubeless tyre car wheel, and a tube type wheel of some kind. Note the safety bead on one and not on the other.
So, if the RG150 wheel is designed for tube fitment (I don't know, not an expert on RG150's), then it should have one, regardless of the tyre.
You can fit a tube inside a tubeless tyre (almost all motorcycle tyres made nowadays are tubeless type anyway). Put some dry talc in there with it to lubricate the tube on the inside of the tyre.