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Old 01-04-10, 08:57 PM   #1
xenologer
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Cutting the knobs off a Knobby Tire?

Suppose Im really really cheap.
And I'm stuck with knobby mtb tires, but ride on pavement.
Suppose it's doable to cut the knobs off and turn it into a very ugly but functional road tire?
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Old 01-04-10, 09:09 PM   #2
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Suppose Im really really cheap.
And I'm stuck with knobby mtb tires, but ride on pavement.
Suppose it's doable to cut the knobs off and turn it into a very ugly but functional road tire?
Yeah. Let us know how long it takes.
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Old 01-04-10, 09:28 PM   #3
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What is your time worth? You can buy decent street tires for about $7 on the web. I got my last set on sale at Nashbar for less than $6 each. Or buy a donor bike at a garage sale or thrift store and swap out the tires. I've done that several times as well.

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Old 01-04-10, 09:30 PM   #4
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keep riding them and the knobs will dissapear by themselves
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Old 01-04-10, 09:58 PM   #5
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Ohwell

Interestingly enough, google search reveals that some mtb-ers actually do cut some of the knobs off their tires for performance adjustments.
http://www.singletracks.com/blog/mtb...-perfect-tire/

So I suppose there't nothing different in principal in cutting them All off, other than spending time...
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Old 01-04-10, 10:16 PM   #6
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Sounds like a good winter project.
A sharp utility knife and a steady hand. Be careful
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Old 01-04-10, 10:21 PM   #7
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Not a good idea. The thickness of the rubber between the knobs is far less than the thickness you'll find on the tread face of even a thin racing tire. So if you do this then you'll most likely suffer from more than the usual number of flats. Anything you save up front will be eaten up by the number of patches or new tubes you'll end up using over the life of this tire. Also since it's so thin a tread face after all this trimming the tire will wear out in 1/2 the time.
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Old 01-04-10, 11:57 PM   #8
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By the time, from start to finish, it will take you to carefully (?) sawing off the knobs on your knobby-tires - you could have gotten enough money to buy a new pair working at McDonald's.

If you follow through with this, may I make a suggestion? Do it with a friend with a digital-camcorder. Put it on u-tube and ask for people to send you donations for your next art project. You'll probably win an award from some art-college you never heard of before!

Keep The Faith!
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Old 01-05-10, 12:18 AM   #9
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Just make sure to keep the cut off knobs in order, as they need to be in their original position when you glue 'em back on to ride off road.
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Old 01-05-10, 01:30 AM   #10
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Seriously?

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Old 01-05-10, 02:36 AM   #11
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This guy beat Capt. Picard by light-years...

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Old 01-05-10, 05:42 AM   #12
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It never ceases to amaze me - the lengths some will go to "save a buck" Look for a cheap donor bike or buy road tires at wally world. Work two extra hours at work and pay for the tires.
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Old 01-05-10, 05:48 AM   #13
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Originally Posted by xenologer View Post
Ohwell

Interestingly enough, google search reveals that some mtb-ers actually do cut some of the knobs off their tires for performance adjustments.
http://www.singletracks.com/blog/mtb...-perfect-tire/

So I suppose there't nothing different in principal in cutting them All off, other than spending time...

The mods you found are for cutting off "some" knobs for riders who could not find the tires in the pattern they wanted. Cutting them all off is a colossal waste of time and will dramatically shorten the tire life. In the end, you will need to buy new tires much sooner. This assumes you are not hurt if and when the front blows out.
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Old 01-05-10, 07:00 AM   #14
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I've cut knobs off, but it was to get the tires to fit on too narrow frames. It was time consuming-maybe 10-15 seconds per knob- 30 minutes per tire maybe. Be careful, once you start rushing it is easy to shave a bit too deep. A decent knife that you can resharpen (during the process) will help.Let the knife movement to the cutting, not your forcing it thru the knob.
It will take close to a hour-maybe more. Wear gloves-leather gloves.
Luck
Charlie
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Old 01-05-10, 07:14 AM   #15
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Could you send me the knobs?

I want to make a mountain bike tire, but all I have are road tires. I figure I could glue those knobs onto the road tire to make a mountain bike tire.

What do you all think of this? Would it work? What type of glue would you use?
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Old 01-05-10, 07:58 AM   #16
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What is your time worth?
How much is his Emergency room co-pay? I have a very nice v-shaped scar on my left index finger from a razor knife, a xc ski boot and an idea that I could turn it into a set of cheap winter bicycle shoes. Real winter shoes would have cost less than the co-pay...and worked better.
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Old 01-05-10, 08:09 AM   #17
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I'll bet you could walk out of Walmart with a set of road-worthy tires for under $20. Then save the knobbies for some time when you need them.
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Old 01-05-10, 08:09 AM   #18
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I have this image of a person standing over a giant sanding drum, holding the tire over the sander, a small pile of rubber on and around his feet. A stinking cloud of burning rubber envelops the whole scene.
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Old 01-05-10, 08:31 AM   #19
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call a temp agency and do a short term assignment on your day off. You should have enough for some tires, tubes, and fenders.
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Old 01-05-10, 08:36 AM   #20
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Old 01-05-10, 10:18 AM   #21
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Let us know if you do it.They are cheap, old MTB tires, right? Not newish worth something.Wear leather gloves, be careful you don't stab yourself in the leg, or the "groin area".You will be tempted to cut toward your body, like pealing an apple.Hold the wheel between your legs and just "saw" away from yourself-repeat,repeat,repeat-400X maybe

If you just slice them down with no particular interest in shaving them flush, or making tham all even, you could do it in 30 minutes total. You'll have to resharpen your knife a time or two probably. I like an actual knife rather than a carpet cutter because I want a fair length of blade to slide across rather than just brute forcing it thru(makes it more likely to slip and cut you when you use high effort).

Yes,I have done waaaay too many "not the best idea, but possible" mechanical things. This is maybe a mid range not great idea- it can work, but it is a lotta work with some danger potential. I just counted the knobs-just 1/4 of them-on one of my tires-50 or so per 1/4-so 200 per tire- 400 total- 4000 seconds- bit over 1 hour of constant work.

Charlie
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Old 01-05-10, 10:33 AM   #22
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Originally Posted by xenologer View Post
Suppose Im really really cheap.
And I'm stuck with knobby mtb tires, but ride on pavement.
Suppose it's doable to cut the knobs off and turn it into a very ugly but functional road tire?
Get these they are only $9.99 each Forté Slick City ST MTB Tire I have a set that are just about new if you really want them I will send them to you, you pay shipping.
Don't cut the off you tires, when I was racing motocross we did slit patterns in some tires for specific reasons but not always and that was several years ago.
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Old 01-05-10, 10:39 AM   #23
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If you lived nearby, I'd gladly give you a well-used, but with a lot of life left in it, Specialized Armadillo 26 x 1.5" tire. I only have one as the rear wore through to the belt after ~10,000 miles. The front tire never suffered a single puncture (neither did the rear) so is in very good condition aside from being covered in brake dust.

Please don't attempt to do what you proposed. You will definitely regret it.
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Old 01-05-10, 10:43 AM   #24
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somewhere out there is a guy with 26" slicks wishing he had some knobbs to glue on so he can ride off road LOL
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Old 01-05-10, 11:46 AM   #25
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A minimum of one hour of cutting-possibly stab yourself "near" the groin - or pay maybe $10 shipping to a generous forum member.
You can imagine how I know how easy it is to stab yourself when you are doing boring, repetitive, high effort cutting.

Let us know how it turns out-either way.
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