Knobby tyre pressure on pavements

Until today my muni had been relegated to a simple point A to point B transportation device… a sad case, but more of that in a mo. For this I’ve had the tyre pressure dead high to try to reduce wear, but I’m wondering about how well that works.

Should the tyre be rock solid to avoid unnecessary surface area rubbing on the ground… or should it be softer, to distribute the wear over a larger area, and make it wear more evenly and gradually?

So far I’m guessing it’s been wearing only on the knobbles on the centre of the tyre, which is probably A Bad Thing. If I let it down a bit, will it last longer?

It’s certainly more comfy that little bit softer…

Phil, just me

Any thing higher that 15lbs is the work of the devil.

-C

Re: Knobby tyre pressure on pavements

In article <phil.d1caz@timelimit.unicyclist.com>,
phil <phil.d1caz@timelimit.unicyclist.com> wrote:
)
)Until today my muni had been relegated to a simple point A to point B
)transportation device… a sad case, but more of that in a mo. For this
)I’ve had the tyre pressure dead high to try to reduce wear, but I’m
)wondering about how well that works.
)
)Should the tyre be rock solid to avoid unnecessary surface area rubbing
)on the ground… or should it be softer, to distribute the wear over a
)larger area, and make it wear more evenly and gradually?

I believe tires will wear slower at higher pressures. At lower pressure,
not only do you have more surface area on the ground, but you have
more twist effects, which are what really wear uni tires quickly.
-Tom

Buy a Continental Town and Country tire… wide (26 x 2.1"), very comfy, inverted tread. Perfect for making your MUni happy when it can’t get to the trail. I used this on my Pashley until I got the freestyle uni.

Save the knobbies for use on the roots and mud.

Re: Re: Knobby tyre pressure on pavements

Bah! I was hoping that the opposite would be true, because it just rides so much nicer with a softer tyre…

Phil, just me

Don’t suppose they do a 24", do they?

Either way, I don’t really want to get a new tyre; It’s not a muni without sometimes taking it off-road, and I don’t want to have to swap the tyre whenever I find a muddy bit.

Phil, just me

No 24" as far as I can tell… but that inverted tread should actually do quite well on many off-road surfaces. It should also do very well in many trials situations.

My nephews ride down very steep grassy slopes on their Primo The Wall tires which have about the same tread roughness.

I’d ride with the tyres good and firm on tarmac. if they are squidgy, you waste energy, and the tyre walls flex which must increase wear.

More to the point, as you lean or turn, the contact point moves on a hard tyre. On a soft tyre, the centre of the contact patch moves but the patch is so big that probably the bits near the middle are always touching the tarmac - so ironically, the middle of the tyre rubs against the road more when the tyre is soft than when it’s hard. Perhaps. :thinking:

Bear in mind I’m in a minority here - I keep my tyres fairly hard all the time, even for MUni. This is partly because I seldom hop or jump, and partly because I’d rather sacrifice a bit of grip and comfort than risk dinging my rim or pinching my tubes.

Hopping (which I’m not yet very good at) is easier with a bit less pressure.

And just like the front shocks on my mtn bike, less pressure lets you ride right over the littler stuff.

My problem is if too little pressure I’ll fold the tire while turning.

Re: Knobby tyre pressure on pavements

On Thu, 24 Oct 2002 11:01:33 -0500, phil
<phil.d1caz@timelimit.unicyclist.com> wrote:

>Should the tyre be rock solid to avoid unnecessary surface area rubbing
>on the ground… or should it be softer, to distribute the wear over a
>larger area, and make it wear more evenly and gradually?

I think hard is better for wear (I mean: results in LESS wear).
Initially, I’ve had very low pressure in my tyre (sorry, no gauge) and
I could hear the knobbies scratch the tarmac much. Go figure, the tyre
surface hits the road in a convex shape and then has to flatten out.
That involves changing distances between knobbies which is done is a
sort of a scraping fashion. The softer the tyre, the larger the
scratching distance. Ergo: wear!

When I ride my MUni to the trail (about 500 metres) I preferably ride
through the verge of the paved path which is grassy (and potholy and
dogshitty :frowning: ).

BTW, the photo of tyre clearance you posted yesterday shows no tyre
wear to speak of. I guess that pic was taken when the tyre was new? I
put up a picture of my clearances which are definitely different from
yours, see the other thread.

Klaas Bil

I posted only a single copy of this message.

Re: Re: Knobby tyre pressure on pavements

Different unicycles… the picture I posted the other day was of my new trials ride; that always has a fairly low tyre pressure. The one I’m concerned about is my larger muni, the tyre of which has been slowly wearing down since it was new in July.

The clearance of the muni is fine; the tyre is more worn out, though…

Phil, just me