Question about 1988 Ducati 851 Strada (Tricolore)

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Tyre pressure Hello! Last weekend I was at the track. Temperature outside was about 15-18 celsius (it's winter here)

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So track was pretty cold too. I run rear tire at 28 psi and front 29psi. Coming off the track I had about 32psi rear and 31psi front. Pirelli SuperCorsa sc2 rear sc1 front. I had great grip and the bike handled very well. However I saw some pictures of my rear tyre and it looked very squashed, like too little pressure. Please have a look at the attached picture. Any comments/thoughts? The tyre temperature after sessions suggestest the tyre didn't heat up abnormally becuse of a too soft pressure. It's my understanding (after talking to other racers here) that you should use harder compound (sc2-3) on cold tracks and sc0-1 for warm tracks. This might seemd odd, but the reason being sc0 is design to run warmer, if you use it on a cold day, only the surface heats up but the carcass stays colder and the tyre surface can shear under load and you lose grip without any warning. A harder tire, sc2, will more slowly heat up and both surface and the carcass will more evenly reach same temperature and flex more uniformly. Any comments on this theory?,Wow! It does appear that the tire is bagged, good for drag racing or riding hefty chicks two up, but on the track...yikes! in my experience(4 years racing 600/750 superbike class), you can expect up to 10 psi difference from a cold tire to a hot one. I learned this lesson the hard way after not checking pressure on a set of new tires bought and mounted at the track that were at 40 psi. For the first few laps, I was flying, 2 seconds faster than my previous best at Nelson Ledges(Cleveland), but when the tires got up to temp, I was coming off the back straight into T12 and with no warning..I turned right off the edge of my tires. That single lapse in attention to the tire pressure cost me the championship(I finished 2nd overall...read:1st loser), $1000 in medical bills, and around $600 in damage to the bike. I typically liked to run 30 psi(f) and 31 psi(r) with Pirelli Medium compound.,,,

Posted on Nov 10, 2008

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Hiya there,

Right then, not exactly the easiest or most straightforward of questions, but as you are a motorcycle rider, this should be easier for you to understand as you have a better idea about the road; than most peoples' perception.

So, tyre pressure? Well of course there is a recommended baseine, but there is also fluctuations you have to allow for; these variables take the form of wether you are uing the bike in warm, hot, cold, wet or dry condtitions; and all of which your tyre pressure is based and adjusted by. Heat, cold and certain road conditions means you will have to make allowances for the pressures within your tyres. Also if you have a lower pressure in your tyre and you ride on a hot day, your tyre pressure will increase.There is a problem with this, if you already have high pressure within your tyres and you decide to go out for a heavy-duty long motorcycle ride. This has a good possibility that you will get a blowout (where the tyre fails dueto extreme high temperature within the tyre walls and the pressure i too much for the compound to take, and as a result; it explodes).

FYG Michelin's website recommends 2.2 Bar Front and 2.4 Bar Rear for all the tyres recommended for use on all the ST series (2/3/4 & 4s) but these pressures only apply to their tyres as the construction is considerably different to some other manufacturers particularly with regard to weight.
Too high pressure will cause premature wear on the centre and reduced grip.
(This may show itself as quicker response due to lack of resistance to turning input)
Lower pressures will cause less wear on the centre and possibly less effective grip in the wet in road conditions due to the tread closing up but can be used to compensate for the higher temperatures developed on track (track days etc)

The best thing here to do is (carefully) wheely on down to Ducati, and get them to tell you; or consult the owners manual, and also the guide on what the tyre company (who supply yours) have to say about this.

Somewhere in the region of 30-32 Psi on the front and 30-35 Psi on the rear should be about right. Remember, hot conditions, slightly lesser, cold, slightly more.

I hope this is the fixya for you and I look forward to hearing how you get on.

Yours sincerely

Oz

P.S.

Please do leave feedback on this, as here there are a lot of questions writing in about tyre pressures and Ducati are a common bike that do attract questions. Your feedback is greatly appreciated as so it too can assist fellow riders in maintaining their pride and joy; and keep them safe for many years.

Thanks again and stay safe on those open roads!!

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so track was pretty cold too. I run rear tire at 28 psi and front 29psi. Coming off the track I had about 32psi rear and 31psi front. Pirelli SuperCorsa sc2 rear sc1 front. I had great grip and the bike handled very well. However I saw some pictures of my rear tyre and it looked very squashed, like too little pressure. Please have a look at the attached picture. Any comments/thoughts? The tyre temperature after sessions suggestest the tyre didn't heat up abnormally becuse of a too soft pressure. It's my understanding (after talking to other racers here) that you should use harder compound (sc2-3) on cold tracks and sc0-1 for warm tracks. This might seemd odd, but the reason being sc0 is design to run warmer, if you use it on a cold day, only the surface heats up but the carcass stays colder and the tyre surface can shear under load and you lose grip without any warning. A harder tire, sc2, will more slowly heat up and both surface and the carcass will more evenly reach same temperature and flex more uniformly. Any comments on this theory?,Wow! It does appear that the tire is bagged, good for drag racing or riding hefty chicks two up, but on the track...yikes! in my experience(4 years racing 600/750 superbike class), you can expect up to 10 psi difference from a cold tire to a hot one. I learned this lesson the hard way after not checking pressure on a set of new tires bought and mounted at the track that were at 40 psi. For the first few laps, I was flying, 2 seconds faster than my previous best at Nelson Ledges(Cleveland), but when the tires got up to temp, I was coming off the back straight into T12 and with no warning..I turned right off the edge of my tires. That single lapse in attention to the tire pressure cost me the championship(I finished 2nd overall...read:1st loser), $1000 in medical bills, and around $600 in damage to the bike. I typically liked to run 30 psi(f) and 31 psi(r) with Pirelli Medium compound.,,,

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so track was pretty cold too. I run rear tire at 28 psi and front 29psi. Coming off the track I had about 32psi rear and 31psi front. Pirelli SuperCorsa sc2 rear sc1 front. I had great grip and the bike handled very well. However I saw some pictures of my rear tyre and it looked very squashed, like too little pressure. Please have a look at the attached picture. Any comments/thoughts? The tyre temperature after sessions suggestest the tyre didn't heat up abnormally becuse of a too soft pressure. It's my understanding (after talking to other racers here) that you should use harder compound (sc2-3) on cold tracks and sc0-1 for warm tracks. This might seemd odd, but the reason being sc0 is design to run warmer, if you use it on a cold day, only the surface heats up but the carcass stays colder and the tyre surface can shear under load and you lose grip without any warning. A harder tire, sc2, will more slowly heat up and both surface and the carcass will more evenly reach same temperature and flex more uniformly. Any comments on this theory?,Wow! It does appear that the tire is bagged, good for drag racing or riding hefty chicks two up, but on the track...yikes! in my experience(4 years racing 600/750 superbike class), you can expect up to 10 psi difference from a cold tire to a hot one. I learned this lesson the hard way after not checking pressure on a set of new tires bought and mounted at the track that were at 40 psi. For the first few laps, I was flying, 2 seconds faster than my previous best at Nelson Ledges(Cleveland), but when the tires got up to temp, I was coming off the back straight into T12 and with no warning..I turned right off the edge of my tires. That single lapse in attention to the tire pressure cost me the championship(I finished 2nd overall...read:1st loser), $1000 in medical bills, and around $600 in damage to the bike. I typically liked to run 30 psi(f) and 31 psi(r) with Pirelli Medium compound.,,,

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Tyre pressure


so track was pretty cold too. I run rear tire at 28 psi and front 29psi. Coming off the track I had about 32psi rear and 31psi front. Pirelli SuperCorsa sc2 rear sc1 front. I had great grip and the bike handled very well. However I saw some pictures of my rear tyre and it looked very squashed, like too little pressure. Please have a look at the attached picture. Any comments/thoughts? The tyre temperature after sessions suggestest the tyre didn't heat up abnormally becuse of a too soft pressure. It's my understanding (after talking to other racers here) that you should use harder compound (sc2-3) on cold tracks and sc0-1 for warm tracks. This might seemd odd, but the reason being sc0 is design to run warmer, if you use it on a cold day, only the surface heats up but the carcass stays colder and the tyre surface can shear under load and you lose grip without any warning. A harder tire, sc2, will more slowly heat up and both surface and the carcass will more evenly reach same temperature and flex more uniformly. Any comments on this theory?,Wow! It does appear that the tire is bagged, good for drag racing or riding hefty chicks two up, but on the track...yikes! in my experience(4 years racing 600/750 superbike class), you can expect up to 10 psi difference from a cold tire to a hot one. I learned this lesson the hard way after not checking pressure on a set of new tires bought and mounted at the track that were at 40 psi. For the first few laps, I was flying, 2 seconds faster than my previous best at Nelson Ledges(Cleveland), but when the tires got up to temp, I was coming off the back straight into T12 and with no warning..I turned right off the edge of my tires. That single lapse in attention to the tire pressure cost me the championship(I finished 2nd overall...read:1st loser), $1000 in medical bills, and around $600 in damage to the bike. I typically liked to run 30 psi(f) and 31 psi(r) with Pirelli Medium compound.,,,

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