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I just had my mechanic put Dunlop Q2 tires put on my K1300S which is fitted with TPM (Tire Pressure Monitoring). The TPM warning went off immediately when I rode off, and so I went back to get the pressure fixed. He had put in 34psi and was reluctant to put in more. Note that he is a certified BMW tech, and works on a lot of high performance bikes. He said that if he put in the 42psi called for by the manual and the TPM, I would get improper wear on the tires. I couldn't ride with a flashing warning light winking at me all the time, so I had him air it up to 37psi, and now the TPM doesn't pester me. Looking at the tirewalls, they say max load 850lbs at 42psi. I ride it like the sports bike it is. What pressure should I run? :confused:
 
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At about 600mi on my bike it picked up a screw in the rear off center. I spotted it before alert came on. Had to make it back home 80mi and the alert did not come on until PSI dropped to 29lb. (Plugged tire myself with motorcycle plugs & got full service out of it.) I've been running the pressures called for in the manual... with the OEM Contis and now with PP2ct's (max 42psi) which I've been running ever since originals were changed out. No strange wear patterns on the tires at all. The front ones get a bit cuppy but that's fairly common on sport bikes where brakes are used hard in turns. Cert tech at my shop fills to 40lb on rear as he says 42 makes bike ride too harshly, which it does tend to. I've considered dropping rear down, but would not go as low as 34lb. Bike gets exceptional fuel mileage!

I removed my TPM's and had the ECU deprogrammed primarily so I could install a 90-deg forged alum Ariete on rear wheel which allows room for easier pressure adjustments at tire pumps. You can see it in pic below on the powdercoated wheel with the anodized blue Ariete. Seal is better than on OEM's.

 

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Tarnsman,
I can see having the pressure that low at the track, 34psi rear, but for street riding, I would be surprised to see that as an advantage with the weight of our bikes. I have not used a tire as soft as the Q, however, so, perhaps your canyon straifing is akin to being on the track at full lean all the time. And your mechanic is familiar with the tire and, I assume, your riding style.

I kept the Conti OEMs at manual recommended and got decent tread life, wear, and traction. Have the PR2ct and so far have run manual suggested 36/42 F/r and am getting consistent wear side to side, great traction in all conditions (no outright rain on these yet), so far with about 1500 miles. With ESA on Norm Solo w/Luggage, the 42 psi is fine with me, not too firm. But if I was to be going out simply for a day of twisties, I would likely drop 2psi to 5 psi front and rear. I do plan to try a Pure Power or Q for track day at end of August and for sure would run them at the lower psi. Probably tape over the indicator if it flashes? But, that would not be my preferred solution of choice for daily riding.

Sheep, earlier you asked what others thought of the grip on the PR2cts at the outside edge. I have full confidence in them. They are scuffing nicely to the edge and feel as good or better than the Conti's. They certainly feel WAY better in the cold and damp of the morning, yet even at 100+ in the late afternoon (3 hours of my 4 hr ride home) they were fantastic too. 102 in Sac at 3 pm then 55 damp and foggy at my houseon the coast at 7 PM
 
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Jim,

Was wondering how secure the PR's were holding on the fast curves hard over. We've had some blistering hot stuff this summer so I'm sure the PR's would have been fine; just not so sure when it drops below 40. Thanks for update, David.
 

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Tarnsman said:
... the tirewalls, they say max load 850lbs at 42psi. I ride it like the sports bike it is. What pressure should I run? :confused:
The 42psi on the sidewall is the maximum pressure, not a recommendation from the tire manufacture. The higher pressure provides better mileage and better rim protection from pot holes. Lower pressure provides better traction. You should play with different pressures and find what works better for your riding style.

My go-to numbers are 30/30 at the track (varies with the tire and temp), 32/36 for sport riding or cold or rainy commuting, and 36/42 for 2-up and commuting.
 
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Good reminder Shark but wish BMW would modify inflation pressure charts for various riding conditions/loads, though they won't add psi's for track use...LOL! Might try your 32/36 for a while and see how the PP2's react.
 

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Think I am going to play around with the pressures as well and see what the PR2s feel like. The 36/42 seems at the top for me (no two-up or touring on the S yet), especially now that my 'company' (Caltrans) has done a lot of dig-outs and repaved major sections of my standard commute route to Sac-n-back - 128 is WAAYY better from Rutherford Ranch to Lake Berryessa's Monticello dam. I'll try dropping 2 psi each this week and 'report back'

Sheep - regarding the lower temps, I only get those in the early early morning before the sun comes up and generally it is pretty damp so between lack of visibility/critters/wet, I generally don't push that hard in those temps. Then in more winter conditions, I generally take the RS with the large Aeroflow since it is a 4 hour ride and I tend to wuss out...
 

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33/39

Tried 33 PSI Front and 39 PSI Rear this week. Not much difference in the morning...of course it was really foggy and wet and my average speed from the coast to inland was only 47 when it is normally 52 mph. But on the way home in warmer conditions of about high 80's to low 90's (no 100's this week thankfully). I did notice the tires seemed to have a bit more grip. I felt very planted and I was honestly scuffing to the very edge in the tight sections out of Anguin and Cloverdale. I am on the PR2ct's and have already felt they were a great tire. With the lower pressures, they feel as planted at the Power I used before, but with far superior wet and cold traction. I liked the feel so much I will be either driving the truck or riding the RS the next couple of weeks as I save the tires for track day on the 29th.
 

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I think the side compounds on the PR2ct are the same as the Powers so it's not surprising that you like them as well. Are you doing Thunderhill or Infineon on the 29th?
 

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Thunderhill on the 29th. Tried to get set up to do ZoomZoom the 28th as well, but don't have leathers (and ride intermediate so have to have leathers), also have not had my glycol coolant replaced yet and just ran out of time and $, (having my front brake line on my K1200RS blow out on the way to Sac Tuesday didn't help, failed at Calistoga on 128 limped on in to A&S with just rear brake)....But THill on the 1300S with the River City Beemers on the 29th. I get to help teach our B group. There is plenty of room left in the beginner and advanced groups from what I understand. www.rcb.org
 

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PR2ct @ the Track

Just a quick update....I had been running my PR2ct's at about 32f/39r for the last several trips to Sac and really liked it. I was helping lead the B group around at our THill track day on the 29th and decided to just leave the settings there. They pressures stayed very consistent on the 150 miles there fully loaded, then all day on the track and then the 150 miles home. Had a great time, but since I was leading the B group, the majority of the day of 180 track miles was by no means at my limits, doing my best to lead others into the 'right' line, etc.But in the afternoon, things opened up, I taped my Instructor Mirrors over and took off like the rest of the group, especially when mixing with the A group. Still most was helping lead others I saw could use the help. Okay, enough caveat-ing.....I was Very happy with the grip all day long, front and rear. Wear was very good, no gumballs like on really soft sport tires, but the softer compound area did show what I call pitting from heat and grip-stress. All the way to the very edge, they had very nice feel. Engaged the ABS on a couple braking segments (even students can rip down the straights and you don't want to dive in front, especially as an instructor....), but never activated the TC on accel. Overall I was exceedingly pleased with their performance for that level on this bike. For maximum fun on a track for myself not teaching, this would not be my choice, but for a B level for us (all beemers so maybe B- at Z^2 or Pac Track, etc) they were fine. Oh, by the way, I did end up getting a set of Alpinestar "Trigger" leathers. Fit great and wer outstanding on the track and road....though they are totally perforated and our temps were 20 degrees cooler than average....only mid 70s to low 80s, so that meant low 50s by the time I got home on the coast at 9 PM....and not much room for extra layers inside. Oh, and I did go on a 2-up ride with my wife yesterday. Felt I should have aired them back up to 36/42, but they did okay.
 

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Sounds like a good time and you were blessed with some awesome weather. It was 113* on my last day at Thunderhill :sun:. I would run the front around 30 psi on the track and found that the rear would come up before the ABS would kick in. If fact I've never had the ABS kick in on the track. I wonder if you would have activated the ABS if your tire pressure was lower :dunno:

Did you get any video of the day? Here's a clip I stole from another rider that was in my group. I come in at the 30 second mark on the right side of the screen passing a couple of riders on the brakes in T14 then pull away down the front straight. http://www.youtube.com/watch?v=JrWq9PPIvAY
 

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Looks great. We were indeed blessed. I wonder about the kickin of the abs as well. I noticed it was only when I 'automatically' used both front and rear, and it felt to be the rear that was pulsing at my foot, not the front, Pics should arrive soon
 
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