re; oil change

[Jeff Saline]

On Fri, 12 Sep 2008 21:59:56 -0000 "Jud Jones" writes:

> From 31 to 38 psi is a 22% increase in pressure. One rule of thumb > that I have seen suggests > that if your tires heat up more than 10%, then you started with them > too soft. Soft > pressures=flexing sidewalls=heat. If you started off with higher > pressure, the sidewalls > would not flex as much, and the tires would run cooler. Last longer, > too. In any case, if you > started at 41psi, you would probably not come close to 50psi when > hot. > > That said, even 50 psi is not going to blow your tire off the rim. > Some tires take that much > just to seat the bead.

<><><><><><><><><><> <><><><><><><><><><> This is +1 (or is that 1+) for what Jud has said about the 10% rule. I think this is a good starting point for paved riding. Off road with slower speeds I think dropping the pressure quite a bit is fine. Like Brian said though you have to consider the conditions so you don't spin a tire or get pinch flats. Best, Jeff ____________________________________________________________ Click here to explore the best options for affordable internet service! http://thirdpartyoffers.juno.com/TGL2141/fc/Ioyw6i3nAc1YO5h81lLwdgvcvU0sCKhl4EMusMkmeFeoALQWrSzVp6/

[boulder_adv_rider]

Interesting. The 10% data-point is new to me. I will note at 31 psi in the rear Mefo there is no detectable sag in the side wall. My guess is the tire can take a lot more psi than we think. I know for sure I've put 75 psi in seating a Dunlop 606. It's just an angry tire. And just so people have the full picture of the situation I described going 31 to 38psi, I had some 100+ lbs of gear, food and water strapped on back, running 72 mph. I have no idea what the pavement temperature was, but the ambient temperature was mild enough for me to wear a t- shirt under some body armor. Now, I'm 70% off-road rider, so something soft but pinch-free is my preference. If I were strictly a road warrior, I'd feel comfortable adding more air but I'd play around a bit to see what you like. Someone noted their front tire wore a weird pattern at 21 psi. My 606 wore wierd but I was running closer to 15 in it. So, yes, I think pressures could go higher. But my experience riding road bicycles is if you make the tires too hard you feel more vibration which can add to fatigue. Of course, the KLR shocks help they don't remove higher frequency vibration.

[wjhaynes2]

THANKS TO ALL FOR THE HELP ON THE OIL CHANGE. SLOWPOKE

[fmhilton]

Thanks for the input... I've raised my tire pressure to 32 front and 42 rear, will try this a while, may be a little hard on ride, may adjust down slightly. Mike H.

----- Original Message ----- From: boulder_adv_rider To: DSN_KLR650@yahoogroups.com Sent: Friday, September 12, 2008 3:31 PM Subject: [DSN_KLR650] Re: MEFO USERS ONLY At the respective max weight ratings, both tires are maxed at 41 psi (cold). Recently, at highway speed my tires went from 31 psi (cold) to 38. So they do expand and heat-up on the highway and with (heinous!) loads. My guess is from this 41 psi, it could take at least 20% above this to nearly 50 psi before the risk of dismounting or otherwise exploding starts. I think for highway you could run the front upto 30psi and the rear to 35 psi with no worry whatsoever. Even the 41 psi F/R would be ok per the manufacturer (Mefo)--Germans make good stuff--but this will mean more vibration and less cushion when pushing big smiles. Now, my fear is alway pinch flats from under inflation (I ride sand/loose media), and I feel comfortable with the F21/R28 never allowing pinch flats. This pressure works on the highway for me, too. Simply, I don't fuss with pressure on the trip just keep it close to F21/R28. Some people like to "air down" below this, but too low I think you're rolling the dice (1) getting pinch flats if you're not riding a beach and (2) sheering a valve stem without rim locks. Brian - who has come to believe if riding your KLR in deep sand looks and feels like a wild bull ride...you're doing it right. [Non-text portions of this message have been removed]