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Old May 7th, 2018, 08:54 AM   #1
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Tire wear - how to compensate?

I noticed that my rear tire didn't look so hot after a day of riding on Saturday. It had been looking good at earlier stops, so I suspect it was the freeway push at the end of the day (high speeds into a headwind) that caused the wear pattern in the pic. Not sure if that was just the cost of pushing me and the bike through a strong headwind at speed or if there is something I can look into with tire pressure or suspension settings to compensate? Tire pressure was set by the dealer the day before after it's first service and the suspension has had a basic setup by a local shop (Catalyst Reaction). All advice welcome (except telling me to slow down).
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Old May 7th, 2018, 10:51 AM   #2
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When I changed my suspension to Mupo, set for my weight and riding style (aggressive on California backroads - NOT race track) my tire life doubled.

What does this mean about the settings? Far more compliant than track settings.

Maybe your spring is the wrong weight too?

All those little tears show limited adhesion. Something I only see on the edges of the tire as cornering limits are found.
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Old May 7th, 2018, 10:55 AM   #3
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See where the feathering should be? Out on the edge.



Chicken strips should be narrow, not wide.
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Old May 7th, 2018, 10:58 AM   #4
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The kind of California roads that provide edge to edge fun:

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Old May 7th, 2018, 11:06 AM   #5
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The purpose of suspension is to maintain the greatest contact with the road surface. Hard settings, or improper spring, and your tire will "bounce" allowing the rear wheel to spin a bit. Like any pickup rear tire does over any irregular surface.

This is why suspension settings are so critical to racers. Set for each track.

The new electronic adjustments ameliorate any poor spring rate. Ducati Skyhook for example.

If you choose to keep your Hyper, a visit to a suspension expert for proper adjustment would be advisable.

Tire pressure matters at extremes.
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Old May 7th, 2018, 12:05 PM   #6
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First of all that's a pretty aggressive sticky tire. I didn't get very many miles out of the one that came on my hyper originally, and that was with a fair amount of highway riding too.

But anyway first thing I would do is double check the pressure. Factory recommended cold pressure for the 2014 hyper SP is 33 front, 30 rear, which is really low and intended for track use because they will heat up with lots of extreme riding. I tend to run 36 front and rear on the street and the tires seem to last longer without giving up too much grip. Every single time the dealer has put my tires at some weird pressure so I never trust them.
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Old May 7th, 2018, 12:46 PM   #7
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I'll have to check pressure. Interestingly a friend showed this picture to Dave Moss who was at the same track day he was today and Dave suggested dropping 2psi and backing off the compression damping. I'll check what pressure the shop set the tires at tonight.

Considering things looked good for the earlier part of the ride which was slower speeds and predominantly back roads it could be low pressure and or stiff suspension settings contributed to the wear.

The pic doesn't show it well, but the only chicken strips on these tires are right at the edges so they are about as well scrubbed in as they'll get under my watch.

I will definitely be keeping the SP as I like the base model 821 enough that buying the SP was my all in plan. I took it to Catalyst within the first 300 miles to get a basic suspension setup, so he has confirmed that the spring rate set properly and backed off the compression and rebound damping quite a bit from the factory settings.

I'm guessing for street riding I can probably explore softening those settings further to keep the wheels better attached to the ground.
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Old May 7th, 2018, 12:49 PM   #8
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This little section was a blast. The road surface was not appreciated by my friend who was riding a Triumph cruiser but it was perfect for the Hyper.
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Old May 14th, 2018, 04:26 PM   #9
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Got around to checking this prior to a bunch of riding this weekend. Tires were set to 36psi cold front and rear. I dropped 2psi and checked pressure after some spirited riding, tires were at around 36psi now while hot. Wear was seems to have been consistent after that but luckily for me the only time I spent on the highway was getting over the bridge and back. Everything else was backroads so no opportunity to sustain the sort of conditions that I suspect caused that wear pattern in the first place.
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Old May 15th, 2018, 12:30 AM   #10
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Quote:
Originally Posted by N4teTheGreat View Post
I noticed that my rear tire didn't look so hot after a day of riding on Saturday. It had been looking good at earlier stops, so I suspect it was the freeway push at the end of the day (high speeds into a headwind) that caused the wear pattern in the pic. Not sure if that was just the cost of pushing me and the bike through a strong headwind at speed or if there is something I can look into with tire pressure or suspension settings to compensate? Tire pressure was set by the dealer the day before after it's first service and the suspension has had a basic setup by a local shop (Catalyst Reaction). All advice welcome (except telling me to slow down).
do you really need a Supercorsa für street use ?
buy a supersport or sporttouring tire and you will be fine.
supercorsa SP is a streed legal tire for track use.

I use Diablo Rosso III for my Hyperstrada and my MototMorini Corsaro for street use and the Supercorsa SP on my Morini (formerly also on my hyper) for track use.

Last edited by ferdi; May 15th, 2018 at 11:03 PM.
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