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Semi-Slick vs Worn out knobby

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Semi-Slick vs Worn out knobby

Old 11-29-06, 10:26 PM
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DirtPedalerB
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Semi-Slick vs Worn out knobby

OK I'll admit it I ride my knobbys on the street more than I should. Especially during the week when it's too much trouble to haul it to a trail.. My rear tire is almost bald. Is there any advantage to running a semi slick tire over a worn out knobby or are they basically the same thing?
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Old 11-29-06, 10:35 PM
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just buy a new nobbie?
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Old 11-30-06, 12:59 AM
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Maybe do a semislick on the rear so it has longer life, and keep a knobbie on the front for grip in dirt and on pavement.
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Old 11-30-06, 09:58 AM
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In car racing, there is a huge diffrence between a bald tire and a slick. The rubber compund is diffrent. The bald tire is extremely dangerous. In bikes, I beleive a tire expert would tell you the same thing. The tread isn't as thick as it should be. A semi slick will give you much longer wear than a worn out knobbie. A new knobbie will wear out pretty fast because it doesn't have the same ammount of rubber as a slick. It is up to you. A worn out knobbie isnt a long term fix. I beleive a slick would last you a while longer.
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Old 11-30-06, 10:05 AM
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I've wondered this before. As near as I can tell, a worn tire is still worn, while the new semi-slick is still new. The rubber will be less thick and less able to deflect punctures most likely.
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Old 11-30-06, 10:25 AM
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Originally Posted by DevilsGT2
Maybe do a semislick on the rear so it has longer life, and keep a knobbie on the front for grip in dirt and on pavement.
You actually get more grip on pavement with a semi-slick than with a knobbie. I'd ditch the knobbies and put a set of semi-slicks on.
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Old 11-30-06, 02:20 PM
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My $0.02.. i had way better flat protection with my slicks. since they had no cutaway parts, the whole width of the tire had thick rubber on it. never ever had a flat with my slicks. and i took them offroad a lot, even on trails littered with blackberry bushes and no problems. i didn't like spinning out on mud and wet grass so i have semi slicks on now, still only 1 or 2 flats in 300 miles through the same type of abuse. i have the "chevron tread" i think it's called. where the tread makes a V pointing down if you're looking at the front of the tire. the continuous line of tread down the middle gives you good smoothness/efficiency/wear when the tires are pumped up fully. if i let out 20 psi then the tread on the side comes into play and is quite stable off road as well.
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Old 11-30-06, 04:38 PM
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Thanks for the advice people... I think you have something on the puncture resistance because I have had 2 flats on it lately both thorn punctures.. Think I'll find me a nice semi-slick style tire or a knobby that has a very low knob spacing to run on the rear. I have run one before that I may still have. It's a michelin jet-s, It seemed kind of heavy, you felt it while starting but it rolled like mad. It's wider than my front tire which makes the bike feel kind of odd to me. I'll check out the tires at the LBS tomorrow as I just snapped my derailler hanger this afternoon and need another one.
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Old 11-30-06, 09:17 PM
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I just wanted to add that the performance of a semislick for mixed on/off road will vary greatly depending on the tread design. A tire with an "inverted tread" will last long for this time of riding, while tires with a "file tread" are usually race-only tires, because they turn into bald tires quickly when ridden on road...at least that's what happened to a pair of bontrager revolts I used to have.
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Old 11-30-06, 10:03 PM
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my current bald knobby has close to 800 miles total on it. about 500 as a front tire and around 300 on the back.. I imagine this is fairly good seeing as around 30 or 40 % of my riding is on rough pavement or pavement that was broken up and then covered with gravel. It's a Ritchey ZED race pro.. quiet on pavement.. I may buy another one for the front and rotate the one on the front to the back. Or maybe go back to irc mythos or mythos slick.. the mythos I had were quick and also decent on pavement.
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