Hey Brad, I may be quite a bit lighter than you - 10.5 stone - and on standard pressures they are good for me up to about 70. I can't recall Yamaha's advice on how hard to go with the pressures, but it's quite a jump. (Their idea of high speed riding is over 60 I reckon). Go with Michelin's advice in any case. They are just guidelines too, if you're, erm, a bit on the large side, you may have to go up a bit?

Allways measure pressures on stone cold tyres, as air expands quite a bit as the tyres warm up. (so no riding to the petrol station if you want a true reading. Cold outside doesn't mean cold inside either!).

I wouldn't want to go much over 70 on them, but I'm close to the pegs pretty regular.

T63 awful on Tarmac? Well, after 6-7 pairs I can say that T63 are very, very good on
tarmac. Front 1.6-1.8 bar, rear 1.7-2.0 bar. If go on very soft terrains, slightly lower
pressures. Feelings you have now are usual, you will get used on T63 in time.

Yeah, knobblies don't feel like road tyres, like a trail bike doesn't feel like a road bike, so maybe it's a confidence thing? ("Feels like I'm riding on oil"??)

You'll find the grip is definately there - just keep lapping a quiet roundabout faster and faster, keep a foot out if you need to, but the angle of dangle will impress you. Personaly, I've bottled it before sliding. (I guess I'm at the age were the number of years has become greater than the number of degrees I'll lean to!)

I've found myself going into wet roundabouts or bends a bit hot, and putting a foot out in preperation for the slide, only to find I get through just fine. And that includes riding past road bikes.

Are you sure that the suspension / bushes etc are all OK?

XT600E Tyres - Recommendations??
 

Many thanks AngusTo You and Antek for your further contributions. To cover the points you have mentioned guys, I am a "trim" 12.5 stone and I like to think it's not a "bottle problem". I am essentially talking about the effect of straight line performance on tarmac. With the TCK80s fitted the bike was happy at 80mph plus on tarmac. I work in PSI me self so up to 1.8bar is 26psi front and up to 2.0bar is 29 rear, so will try upping front tyre pressure and reducing rear pressure and see how I go. Yamaha recommendations are 1.50 bar front (22 psi) and 2.25 bar rear (33psi). Not sure what Michelin recommend but will check their website and see if I can get some info on recommended pressures. Suspension/bushes etc seem fine, but I will take the bike to my local friendly dealer and get him to give it the once over to make 100% sure. Other possible option is to get the wheels balanced if altering the tyre pressures doesn't bring about any improvement???
Thanks again guys, I am sure I will crack the problem in the end.

Michelin SIRAC's are the dogs....
 

I put a set of Michelin Sirac's on my 1999 (5,000 miles) XT600E at the start of last Summer. I must tell you how hugely impressed I am with them compared to Trail Wings. I would describe them as a road biased tyre but with an agricultural tyre pattern (70% road, 30% light trails). I have used them for light green laning and they were Okay. As an all round adventure type tyre you can't beat em. They look quite good on a big trailee as the rear tyre is quite agricultural looking...

You can give that a go, but you would normaly get wobble rather than a weave with out of balance tyres. A weave is usualy indicative of something soft, be it tyres or suspension.

You'll probably have to take the the wheels off, but spin them, when they stop, mark the bottom and spin them again, and again, and again, and see if they stop spinning in the same position. (Heavy spot down).

Just shuffling the tyres round the rims might help.

They are on concentricaly aren't they? There should be a fitting line, all around the tyres on each side, which is high enough above the bead of the tyre to be seen by the rim. This should show an even amount above the rim all the way round, and on both sides.

Even professionals make a pigs ear of fitting some times!

Hi Brad,

I think you might be running too high a pressure.

I suggest 20psi in the rear max and 15psi front. Just make sure you have good tyre anchors fitted fron and rear.

Try them out carefully and see how you get on. Quite often a mannual is for road biased tyres. you will want to drop them even lower when you hit the sand of the oh so wonderfull Sahara.

Good luck and enjoy your trip.

Regards Sam.

XT600E Tyres - Recommendations??
 

Hi there guys and Scottish Sam. I have checked the bike over thoroughly and all is OK other than a couple of loose spokes in the front wheel which I have tightened. Next stage was to experiment with tyre pressures, so tried 26psi front and 29 psi rear. Again terrible! Ok lets go for it! 30psi front and 36psi rear and see what happens. Wow, what a transformation! I am riding a different motorsickle! I have clearly been running far too low tyre pressures for tarmac riding, despite what seems to be the recommended pressures for T63s. I will continue experimenting with pressures to get the optimum figures for tarmac, but I ain't far out with 30/36. Then I will follow the same process of experimentation for off road using lower pressures. Never had this problem before with tyres pressures! Ain't life strange sometimes!
Cheers to all!

Glad things are sorted out. :thumbup1:

I just want to add that when I switched from road tires to trail ones (Pirelli MT21) I had the same strange feeling on road, that I was riding on oil :) But then I got used to it and now I am pretty confident when leaning (boot touches pavement) . Grip when going offroad is excelent! However, they seem to run out pretty fast if you also ride on road (2500 km from the rear).

I think I'll try the T63 next.


Take care,
Adrian