Concours Owners Group (COG) Forum

Concours 14 Discussion (C14 / ZG1400 / 1400GTR) => Concours 14 / ZG1400 General Chat and Tech => Topic started by: Jim on March 24, 2019, 09:12:25 am

Title: tire pressure
Post by: Jim on March 24, 2019, 09:12:25 am
 :great: A soaking rain to wash away road salt and relatively mild temps for the weekend has kicked off my riding season here in Newburyport Mass.. This will be my first full season with my 2015 Connie as I purchased last Sept.. My tire sensor indicated 36 PSI front and 37PSI rear (cold). I got them to 41PSI front and 43 rear (cold). I went for a ride and they went up to 42-43 PSI front and 44-45 PSI rear (warm). I know manual recommends 42 cold front and rear. My hand gauge and gauge on my compressor seem to match the tire sensors pretty well but don't indicate pressure as precisely as sensors. I need to get a better set up with my compressor because its one of those small ones with a screw on air fitting (challenging) to get air right. I guess my question to you all is is this close enough or do I need to have them at 42F and 42R to get best wear, performance, and safety. thoughts? Jim
Michelin pilot 3`s or 4`s I forget
Title: Re: tire pressure
Post by: C. Moore on March 24, 2019, 09:20:35 am
Your'e fine in my book. Ride safe. :great:
Title: Re: tire pressure
Post by: oldnslo_MO on March 24, 2019, 11:31:42 am
 :iagree:
Title: Re: tire pressure
Post by: robertv on March 24, 2019, 12:10:29 pm
You should be good to go! Here's a helpful thread on temps when filling up...

http://forum.cog-online.org/tires-suspension-c14/consistent-tire-filling-finally (http://forum.cog-online.org/tires-suspension-c14/consistent-tire-filling-finally)
Title: Re: tire pressure
Post by: cuda on March 24, 2019, 12:25:03 pm
For our track day, I went to 30psi  :dance:
Title: Re: tire pressure
Post by: IBAJIM on March 24, 2019, 12:44:04 pm
I would rely on a good quality digital gage for measuring tire pressure.  If it matches another good quality digital gage, within 1/2 psi,  I would believe it to within 2 psi.  It would be hard to find a gage that is accurate to within 0.1 psi over a wide pressure range, BTW, unless you want to pay big bucks.  Every gage has some error.  And gage resolution and accuracy are two different things.  Just because a gage measures to within 0.1 psi doesn't mean it is accurate to within 0.1 psi.

If you can measure to an accuracy of 0.5 psi, that should be good enough.  But good luck finding a reasonably priced gage that has that accuracy. 

For example, this gage measures to within 0.1 psi but is only accurate to within 2 psi !!

https://shop.slime.com/collections/digital-tire-gauges/products/0-99-psi-digital-tire-gauge?variant=47566992584 (https://shop.slime.com/collections/digital-tire-gauges/products/0-99-psi-digital-tire-gauge?
variant=47566992584)

Don't rely on the TPMS readouts for accuracy.  Their purpose is only to tell you that you may have a tire leaking air.

EDIT:  Here is a digital gage claimed to be 0.1% accurate  ( +-  0.04 psi @ 40 psi )  for under $300.  I'm not sure if I believe that accuracy,  but I bet it's within 0.4 psi and that's good enough.

https://www.intercompracing.com/9999-psi-digital-air-pressure-gauge-p-181.html (https://www.intercompracing.com/9999-psi-digital-air-pressure-gauge-p-181.html)

I'm surprised no one makes a digital gage with a claimed accuracy of +- .2% for around $75.   That would be one order of magnitude better than the link for the basic gage above ( first linky ).

This one looks decent ( +- 0.4 psi @ 40 psi ) and at a good price, but the chuck would need to be changed so it would work with a MC straight stem.   I think I'll get one.    https://www.eastwood.com/eastwood-digital-tire-pressure-gauge-inflator.html (https://www.eastwood.com/eastwood-digital-tire-pressure-gauge-inflator.html)
Title: Re: tire pressure
Post by: JerBear on March 24, 2019, 05:13:20 pm
This is what I use it has a .5 psi resolution, it's digital, and small enough to carry in your pocket/bag and reach the small area in the front tire .  It shuts it self off so it won't drain the battery (although that can be aggravating) and costs less than 10 bucks.  I'm sure at that price it's probably w/i 2-3 psi but it measures almost always the same as my sensors do..
Best of all I buy them at a Walmart so you don't have to wait to get a replacement, they seem to last about three years for me.


https://shop.slime.com/collections/digital-tire-gauges/products/mini-digital-tire-gauge-5-150-psi?variant=45259154312

Slime makes good inexpensive tire equipment IMO  ;D
Title: Re: tire pressure
Post by: Red Fox on March 24, 2019, 11:53:39 pm
My tire sensor indicated 36 PSI front and 37PSI rear (cold). I got them to 41PSI front and 43 rear (cold). I went for a ride and they went up to 42-43 PSI front and 44-45 PSI rear (warm). ... I guess my question to you all is is this close enough or do I need to have them at 42F and 42R to get best wear, performance, and safety. thoughts? Jim
Michelin pilot 3`s or 4`s I forget

You're right there with the majority of riders on pressure. 

When my TPMS readout comes on after 200 yds of riding, it's accurate and precise to my two quality gauges. 
This is a heavy bike, and I prefer its handling with stiff tire pressure, and front a couple pounds more than back.
Title: Re: tire pressure
Post by: TimR on March 25, 2019, 12:39:17 am
I'm not as lucky as Red Fox. My TP readouts on  the dash are close but not actual TP. They are a couple of LBS off but still can tell if I'm low or not. My dash lights up when a sensor reads 36 psi. Generally I go with 42psi in both.
Title: Re: tire pressure
Post by: TireguyfromMA on March 25, 2019, 04:30:42 am
Hey Jim,

Stop by, I'm in Gloucester.  I have two really good gauges, one is from Longacre, the other is PSIClops, both are accurate within 1lb up to 60psi.  We can compare what your TPMS is reading compared to one of my gauges.

http://www.longacreracing.com/products.aspx?itemid=1716&prodid=7306&pagetitle=Magnum%E2%84%A2-3-%C2%BD%E2%80%9D-Tire-Gauge (http://www.longacreracing.com/products.aspx?itemid=1716&prodid=7306&pagetitle=Magnum%E2%84%A2-3-%C2%BD%E2%80%9D-Tire-Gauge)

Cheers
Title: Re: tire pressure
Post by: TimR on March 25, 2019, 04:36:37 am
I wish I could stop by but it would be a LOONNNG ride.
Title: Re: tire pressure
Post by: TLR on March 28, 2019, 04:51:39 am
Jim,

Anywhere from about 36 - 42 will do, from all that I've read, here and other places.

A few years ago, someone on here posted that when attending track days, the students put on new tires and inflate to somewhere around 25 - 29(?)  I forget exactly, but somewhere in the twenties.

I take that to mean that these tires are fine a little deflated, and a little deflated gives you more traction.

So, I run about 38 - 40, and hope my quality air gauge is accurate.

I'll gladly trade maximum wear for better traction.

But, somebody can correct me if I'm wrong about this.
Title: Re: tire pressure
Post by: IBAJIM on March 30, 2019, 01:16:55 am
So, FYI :

Got my  Eastwood digital tire pressure gauge today.  It's a rugged and nicely made piece of equipment.

I went out and checked the pressure in one of my car tires with it and two Slime digital gauges I also have.

The Eastwood gauge read 37.7 psi and both Slime gauges read 37.5 psi.  So, it looks like the Slime gauges are pretty accurate - much better than their +- 2 psi advertised accuracy, assuming the Eastwood gauge is accurate to + - 0.5 psi as advertised.  One is the new style and the other is the older style, but I bet the internal circuitry is the same in both Slime gauges.  They both have been around for several years.
Title: Re: tire pressure
Post by: Bruiser on April 15, 2019, 04:37:50 pm
I found (at least on my ‘12), the TPMS requires a PSI of greater than 35, otherwise, they will flash low tire pressure. Plus, the bike handles a lot nicer with pressures of 40psi. I run Pirelli Angels