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Old 11-26-2012, 12:15 PM   #31
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Re: Break in period for Q2's?

Anyone telling you to run low PSI on the street is just setting you up for a quicker wear and possible tire cupping; take this into consideration when setting tires PSI...I'm talking regular commuting to work and what not, not canyon riding.

I disagree with some of the PSI levels being thrown around in here, just me though.
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Old 11-26-2012, 12:53 PM   #32
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Re: Break in period for Q2's?

Quote:
Originally Posted by mac7504 View Post
Anyone telling you to run low PSI on the street is just setting you up for a quicker wear and possible tire cupping; take this into consideration when setting tires PSI...I'm talking regular commuting to work and what not, not canyon riding.

I disagree with some of the PSI levels being thrown around in here, just me though.
I'd rather be running 30/30 than 36/36 on the street..
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Old 11-26-2012, 12:53 PM   #33
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Quote:
Originally Posted by mac7504 View Post
Anyone telling you to run low PSI on the street is just setting you up for a quicker wear and possible tire cupping; take this into consideration when setting tires PSI...I'm talking regular commuting to work and what not, not canyon riding.

I disagree with some of the PSI levels being thrown around in here, just me though.
At 34psi I got almost 10k miles out of a q2
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Old 11-26-2012, 01:04 PM   #34
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Re: Break in period for Q2's?

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Originally Posted by pickpocket293 View Post
I'd rather be running 30/30 than 36/36 on the street..
Psssh, not me...I did for a while and found my front tire was starting to cup...(Think it was 29/29) or somewhere around there.

I run that PSI on the track but not the street, again just me and my preference.

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Originally Posted by bryan j View Post
At 34psi I got almost 10k miles out of a q2
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Old 11-26-2012, 01:10 PM   #35
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Re: Break in period for Q2's?

I run 37 front and 38 rear for commuting

For canyons/twisties...33/32

For track....30/28

These are for my S20's as well as my previous OEM dunlop sportmax'
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Old 11-26-2012, 01:52 PM   #36
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Re: Break in period for Q2's?

Everyone who's running above a 32/32, do you still think that's alright for cold weather street riding? I'm talking less than 45-50 degrees F or so, with nights getting down into the 30's (I do some riding early in the morning before it's warmed up at all).
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Old 11-26-2012, 02:02 PM   #37
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Re: Break in period for Q2's?

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Everyone who's running above a 32/32, do you still think that's alright for cold weather street riding? I'm talking less than 45-50 degrees F or so, with nights getting down into the 30's (I do some riding early in the morning before it's warmed up at all).
Honestly, you have to feel what works for you in the conditions you ride in.

You could start at 32-33/32 and work your way from there...You have to allow the tire to heat up a bit as well, so don't go out and romp it out of the gate, even with lower PSI.
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Old 11-26-2012, 02:05 PM   #38
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Re: Break in period for Q2's?

I run 32/32...

BTW, I'm rolling with supercorsa (semi-track) and they're also very slippery when they're cold. Took my bike for a ride last month before storage (temp was around 50F-60F) and almost lowsided in a curve (too much acceleration, I know.)

Just warm then enough before twisting the throttle. Even if they're new, I don't think there's any major ''break-in'' to do. You can still do a burnout but I don't think the neighbors are gonna like it lol
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Old 11-28-2012, 01:19 PM   #39
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Re: Break in period for Q2's?

In theory there is no " break in " period. But the tire must be up to operating temp in order to provide maximum potential. This is a hard task to accomplish on the street because there is not a lot energy rolling the carcass around in order to make it heat up.

Heat in the tire is generated by having the carcass flex and also friction from the pavement. You have heard the term scrubbing speed in the corners. This is a very true representation of what is occurring. The tire is literally scrubbing the ground and speed is being lost from that friction; engine braking and trail braking aside.

The higher the tire pressure the less amount of carcass flex that is going to occur. The lower the tire pressure the more carcass flex that will occur. A popular thing to do on the street is to lower the tire pressure in order to increase tire temp therefore increasing available traction. The downside is shortened tire life. The opposite occurs when you increase tire pressure. The higher pressures reduce potential heat and grip in the tire, but increases the tires life and wear.

Street tires don't do too well with very low pressures. They are designed to be ran at most of the factory spec's of about 36 PSI. Most canyon runners will do the classic 30/30 trick to increase tire performance. It is a good practice to run the street tires with the same pressures front and rear for two reasons.

1. It's easier to keep an eye on and track the tire pressures.

2. The tires were designed to run at the same pressures in relation to each other. Hence the factory 36/36 as a standard.

Most street tires do not do well at pressures below 30 PSI. Some will most won't. They start to get squirmy and wear too fast when you go below 30/30. The 30/30 pressure is also the cold tire pressure........NOT HOT TIRE PSI......... Remember to set your tire pressures cold for the street.

That being said, you are looking for about a 5-7 PSI increase from operating temp in a street tire. So if you start at 30/30 and they each increase to 35 PSI. Then that is a good thing. If they go up to 38/38 respectively you will want to add some tire pressure to help cool the tire down. The tires usually don't increase in tire pressure equally. The rear is usually the hotter tire with the higher pressure. If the pressure is less than 5 PSI you can lower the tire pressure so long as you don't go too much below 30 PSI as a rule. This is the regiment for the aggressive canyon rider. The every day street rider should stick to factory recommended pressures for both safety and longevity. Low tire pressures when cold make for a squirmy and sluggish machine.

I found that 28 PSI is the lowest safe pressure that can be run with a street tire while canyon running. The tire won't last long and it is rather squirmy and the bike wallows until heat is generated and pressures come up. I don't recommend going below 30 PSI basically. Also the quickest and most effective way to generate heat in a tire is to do aggressive braking and accelerating. That wallowing side to side thing does absolutely nothing to generate heat in the tire. wallowing side to side can actually strip heat away! Aggressive braking and accelerating has been found to increase heat the most and is the closest thing you can get to a heated run. It takes about 10-15 min for a tire to come up to temp in the canyons even with a heated pace, so please keep that in mind. It takes time for the tire to get to it's highest potential. Respect that and you will keep yourself out of a lot of trouble.
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