26x1.25 tires...Fat Boy vs Cheng Shin Primo "racer" vs Perf. Slick City

[Chester]

Just wondering if anyone has tried the Cheng Shin Primo "Racer" tire?

The Cheng Shin Primo is advertised as 110 psi
The Specialized Fat Boy is rated at 100 psi
The Performance Slick City is rated at 85 psi

I actually think Cheng Shin may well be the company that makes the other two tires also for Specialized and Performance Bike, but not sure about that

I have some interest in this Cheng Shin Primo because I've seen some tests from a few years ago where they produced some mtn bike slicks with really low rolling resistance ratings.
Lower than Ritchy Tom Slick and Fat Boy ratings.
From what I know, Cheng Shin is also the owner or maker of Maxxis tires, so I'm not concerned about their quality or technology.

By the way, the Cheng Shin is $23, the Fat Boys are about $20, and the Performance Slick City is now on sale for only $9.95 ( I've already got two of these but was looking for something faster and able to handle higher pressure)

Who knows,,,,,,,,,,all three tires may be almost identical, but lawyers for Specialized, and Performance may be telling them to keep the psi down just for CYA reasons.

Anyway, any knowledge of this Cheng Shin Primo "racer" tire?

[shiggy]

I would use any of them and I personally not run any of them at more than ~85 psi for performance, traction and comfort reasons. The less you weigh, the lower the pressure you should be using.

I used the Fat Boys on a tandem at 110 psi.

[shiggy]

Remember these threads?
Can light riders put psi over maximum limits of the tire?
1.25 to 1.0: Worth $76?

[Chester]

Remember these threads?
Can light riders put psi over maximum limits of the tire?
1.25 to 1.0: Worth $76?

I think I've gotten a little too "into" finding the absolute perfect tire for my needs....

Did call J&B distributer only to find that the Cheng Shin Primo racer is not 110 psi anyway but the same as most of the rest, limited to 100 psi for the 1.25 version.
Perhaps I should just ride my 1.25 Performance house brand cheapies for a month or so and see what I think. As you said, I many not even want go be higher than 85-88 psi anyway and they only weigh about 25 grams more than the others, so weight is not the issue.

With all the hundreds or even thousands of bicycle tires out there, it is doubtful we'll ever see some comprehensive and "accurate" testing of rolling resistance done on one machine under one set of criteria for all the tires.
Even the various German magazine articles varied from year to year on the same tire.
The 3 or 4 watts per tire I am chasing may not even actually exist if testing was accurate.

Also when I look at the 1.0 versions, they look scary since I like to begin my rides which end up on the road, with a gentle few miles through the park fire roads between my house and the "road riding" roads. Not many bumps at all but geez those 1.0's look like little points instead of surfaces. If I ever do run one, I'm gonna just put it on the rear for a trial since 60% of my weight (and thus rolling resistance) would be there.
I do realize however that a 1.0 at 115 may not have lower rolling resistance than a good 1.25 at 100 and that, as you said, neither may be optimal at their maximum allowed psi.

Thanks for your imput