cT K28 Tire Wear

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RC20
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Re: cT K28 Tire Wear

Post by RC20 » Sat Sep 07, 2019 9:31 pm

2019 Manual for the cT is: 32 - 36 -32

Some thoughts of running lower than I am and even up wear from center.

Will do some checks on the side tread vs center. Of course its raining now, hot dry summer and then rainy.

What happened to cool and nice?
Formerly Owned: ( various rides on others)
Honda 90
2 x CB750K (one a true Japan Model flown to Hawaii by a P3 Orion Sub Patrol Aircraft!)
1 x CB700 SC (RC20 is the actual in house production Model)
1 x R80GS (ok to start with, learned to love it for what it was)
1 x CB450K
1 x 2019 cT Terracotta

Mechanic/Technician/Engineer: Electro Mechanical Systems

RC20
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Re: cT K28 Tire Wear

Post by RC20 » Mon Sep 09, 2019 4:17 pm

We got a break in the weather and I ran tread depth profile on each of the 3 active tires.

What it amounts to is that the pusher is wearing more in the center, where as the front and side car are wearing evenly from center to the side tread.

To me that says the pusher tire is/ has been over inflated. Dropping it down would bring in the side treads and lower the overall wear rate.

So while I am staying with 32 in the front and side care I am lowering the pusher to 32 as well. Run that for a while and see how it progresses.
Formerly Owned: ( various rides on others)
Honda 90
2 x CB750K (one a true Japan Model flown to Hawaii by a P3 Orion Sub Patrol Aircraft!)
1 x CB700 SC (RC20 is the actual in house production Model)
1 x R80GS (ok to start with, learned to love it for what it was)
1 x CB450K
1 x 2019 cT Terracotta

Mechanic/Technician/Engineer: Electro Mechanical Systems

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Manscout
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Re: cT K28 Tire Wear

Post by Manscout » Mon Sep 09, 2019 4:24 pm

RC20 wrote:
Mon Sep 09, 2019 4:17 pm
So while I am staying with 32 in the front and side care I am lowering the pusher to 32 as well. Run that for a while and see how it progresses.
Be careful. I know I am on a Patrol, and not a CT, but I have easily gotten pinch flats running under 34 on the pusher.
"It goes nowhere fast, and everywhere cool".

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Tomcatfixer
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Re: cT K28 Tire Wear

Post by Tomcatfixer » Mon Sep 09, 2019 4:34 pm

I tried dropping my cT's pusher to 36psi in an attempt to even out wear and did NOT like how it affected the handling, so I went back to 40psi.
- Chad

Gordonsville, Virginia, USA

Current rides:
2015 Ural cT "Mobile Chernobyl", 2001 Ural Patrol "The Patrol", 1999 Ural Tourist "The RPOC", 1994 Honda VFR750F

Previous rides:
2007 Honda VTR1000 FireStorm (Super Hawk in U.S.)
2001 Buell Blast! - - - - - - - 2005 Yamaha FJR1300
1993 Honda CBR600F2 - -1984 Yamaha FJ1100
Two different 1986 Yamaha FZX700S Fazers

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Mr Wazzock
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Re: cT K28 Tire Wear

Post by Mr Wazzock » Mon Sep 09, 2019 6:04 pm

Image what both the previous said.

Like Chad I tried lowering the pusher psi, handling was horrible so it immediately went back to what it was. Despite that I was told beforehand (by the bloke who gave me tuition) that the bike rear tire has to be hard. It's hard for a reason. Altho whether I can expiain it is something else. :D

Also, and I may be wrong here, but, you could get tire creep at lower pressure Iit is the driving wheel after all, and the rig is heavy — it is usually the case that the driving wheel[s] on any vehicle have the higher pressure, including cars) which may pull on the valve stem and in worst case tear the inner tube. I think this has been done by member(s) here! When I had my pusher flat 2 years ago the short distance it went for when soft or deflated (and I mean a mile or so first time, then only yards getting it off the recovery vehicle) the valve stem was definitely wonky.

As to the different wear patterns, yes I think I concur, mine are/were the same I think.
Mike H
2016 Ural cT, in glorious terracotta
(aka Oranzhevaya Opasnost, "The Orange Peril")

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:FI:Igor
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Re: cT K28 Tire Wear

Post by :FI:Igor » Mon Sep 09, 2019 6:20 pm

On my Duro's (because I'm a cheap bastard and they work great): Tires average 6074km drive, front 48381km, sidecar tire still looks new at 52,000 km
2015 Ural Patrol (Светлана)
2006 HD Low Rider (sold)
2013 Ural Patrol 'Ursula' (2015 Totaled!)

RC20
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Re: cT K28 Tire Wear

Post by RC20 » Mon Sep 09, 2019 6:44 pm

I have caught the cT tires at 28 PSI a couple of times when I have not ridden it and I had no issue. 32 will be fine for now anywya.

Maybe I am not a sensitive kind of guy but I will go with lower for now and see how the wear looks down the road.

I suppose the rear frame could be misaligned and the rear is scrubbing but it sure does not look like it.
Formerly Owned: ( various rides on others)
Honda 90
2 x CB750K (one a true Japan Model flown to Hawaii by a P3 Orion Sub Patrol Aircraft!)
1 x CB700 SC (RC20 is the actual in house production Model)
1 x R80GS (ok to start with, learned to love it for what it was)
1 x CB450K
1 x 2019 cT Terracotta

Mechanic/Technician/Engineer: Electro Mechanical Systems

RC20
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Re: cT K28 Tire Wear

Post by RC20 » Mon Sep 09, 2019 6:44 pm

:FI:Igor wrote:
Mon Sep 09, 2019 6:20 pm
On my Duro's (because I'm a cheap bastard and they work great): Tires average 6074km drive, front 48381km, sidecar tire still looks new at 52,000 km
307?
Formerly Owned: ( various rides on others)
Honda 90
2 x CB750K (one a true Japan Model flown to Hawaii by a P3 Orion Sub Patrol Aircraft!)
1 x CB700 SC (RC20 is the actual in house production Model)
1 x R80GS (ok to start with, learned to love it for what it was)
1 x CB450K
1 x 2019 cT Terracotta

Mechanic/Technician/Engineer: Electro Mechanical Systems

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:FI:Igor
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Re: cT K28 Tire Wear

Post by :FI:Igor » Mon Sep 09, 2019 7:21 pm

HF308 with one tube of Ride-On. I pay something like 65 USD through Amazon (shipping included). Once in a while much cheaper (troops in this forum occasionally spot really good deals on that tire). I stay on paved road 98% of the time. Rig is my primary transportation; I have a car and two trucks, but I prefer the Ural. In south Alabama you can ride 365 days a year; but geez it's hot now!
2015 Ural Patrol (Светлана)
2006 HD Low Rider (sold)
2013 Ural Patrol 'Ursula' (2015 Totaled!)

RC20
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Re: cT K28 Tire Wear

Post by RC20 » Mon Sep 09, 2019 7:39 pm

I picked mine up in that Alabama heat (Portland OR) Ungh. You can have it. I'll take my snowy cold days and chances!
Formerly Owned: ( various rides on others)
Honda 90
2 x CB750K (one a true Japan Model flown to Hawaii by a P3 Orion Sub Patrol Aircraft!)
1 x CB700 SC (RC20 is the actual in house production Model)
1 x R80GS (ok to start with, learned to love it for what it was)
1 x CB450K
1 x 2019 cT Terracotta

Mechanic/Technician/Engineer: Electro Mechanical Systems

RC20
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Re: cT K28 Tire Wear

Post by RC20 » Wed Sep 11, 2019 3:20 pm

Added Data Table:
Ural cT Wear Profile 9-2019.doc
Formerly Owned: ( various rides on others)
Honda 90
2 x CB750K (one a true Japan Model flown to Hawaii by a P3 Orion Sub Patrol Aircraft!)
1 x CB700 SC (RC20 is the actual in house production Model)
1 x R80GS (ok to start with, learned to love it for what it was)
1 x CB450K
1 x 2019 cT Terracotta

Mechanic/Technician/Engineer: Electro Mechanical Systems

RC20
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Posts: 1044
Joined: Thu Apr 19, 2018 11:59 am
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Re: cT K28 Tire Wear

Post by RC20 » Wed Sep 11, 2019 3:46 pm

Added the current wear Data here as well:
Ural cT Wear 2200 Miles 9-2019.jpg
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Formerly Owned: ( various rides on others)
Honda 90
2 x CB750K (one a true Japan Model flown to Hawaii by a P3 Orion Sub Patrol Aircraft!)
1 x CB700 SC (RC20 is the actual in house production Model)
1 x R80GS (ok to start with, learned to love it for what it was)
1 x CB450K
1 x 2019 cT Terracotta

Mechanic/Technician/Engineer: Electro Mechanical Systems

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windmill
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Re: cT K28 Tire Wear

Post by windmill » Wed Sep 11, 2019 10:58 pm

This is what my K28 pusher looked like when I took it off the other day at 9925 miles (15880 Km). Just for comparison with a Duro 308 I would get around 2800 miles (4500 KM), or with a Hiedenau K37 3500 miles (5500 Km).
IMG_3198.JPG
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Barry

"Take care, sir," cried Sancho. "Those over there are not giants but windmills".

2007 Patrol 100k km and counting,
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Re: cT K28 Tire Wear

Post by Alex_P » Thu Sep 12, 2019 4:19 am

IMG_20190912_101009.jpg
But the Olga runs at least 2000 km with max. payload :roll:
All tires are the first ones from the factory.

The depth on the other tires:
Front: 6,5 mm
Sidecar: 6 mm
Spare wheel never used: 8,5 mm
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RC20
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Re: cT K28 Tire Wear

Post by RC20 » Thu Sep 12, 2019 2:49 pm

The variation is startling.

Front and side car look to go 15,000 US miles and so even as to not even need rotating.

Pusher is about half worn out so call it 4000-5000 US miles

Weill see if the drop in air pressure improves things but that is going to take some time to manifest itself one way or the other.

I can move the spare to the rear when the time comes and go with whatever strategy seems to be best.
Formerly Owned: ( various rides on others)
Honda 90
2 x CB750K (one a true Japan Model flown to Hawaii by a P3 Orion Sub Patrol Aircraft!)
1 x CB700 SC (RC20 is the actual in house production Model)
1 x R80GS (ok to start with, learned to love it for what it was)
1 x CB450K
1 x 2019 cT Terracotta

Mechanic/Technician/Engineer: Electro Mechanical Systems

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