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  • Tire Sizes for KH 20

    From what I know all the 20" Trials unicycles are actually 19" rimmed. The description however is 20". This holds true for the tires also. For example the Maxxis Creepy Crawler is described as a 20X2.5 inch tire. Is this the same size tire that would fit on a BMX bike? I just got a KH 20 and just assumed that I could use any decent BMX tire on it. Is this the case or do I have to get special 19" tires?


    Unicorn
    Keep your eyes on the stars and your feet on the pedals, and you will accomplish great feats!

    The Unicycling Commune

  • #2
    Where does the 19" come from?

    Measuring my KH 20 installed tire diameter, I get 20.5". A Rim Diameter of 15.5"
    My guess is they call it 19" because it uses a fatter tire from the "mod 20 inch" size trials bike, which is different then a regular 20" bike tire. Reading the sidewall of my maxxis creepy tire on the KH20 it says 67-387 (20x2.5).
    So where do they get 19 inch from?
    I guess, the point is to make sure you are buying a "trials " tire.
    I just taped the tire and rim of my cheapo regular 20" uni. It has rim diameter of 16 3/4" and a tire installed diameter of 19 3/4". It's tire says 50-406 (20x 1.95). So strange. Both tires are marked 20xsomething, yet the trials rim is 1 1/4" smaller diameter.
    Last edited by feel the light; 2007-07-26, 02:11 PM.

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    • #3
      i dont know where they get the measurements from... but a bmx tire will NOT fit on a trials rim.
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      • #4
        the 20" is referring to the outside diameter of the tire. It needs mod tire, you can def not put a 20" BMX tire on it.

        Think of it as frame size. Its a 20" frame, you could install a 20" bmx style wheelset on that frame.
        Last edited by agentQ; 2007-07-26, 02:29 PM.
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        Uneed Films

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        • #5
          It's called a 19" because it's a little smaller than a 20" rim. However this isn't used in the bike fraternity as much, they use the word 'mod' to refer to 19" rims and tyres. The number refers to the OD of the tyre anyway, so calling both BMX and mod tyres 20" isn't wrong, the whole reason mod rims came about was to get a fatter tyre but with the same OD as a BMX tyre, so it would still fit in the same frame, so they are intended to be approx. the same outer diamtre. I'm afriad it's just one of those thigns you have to know if you want to ride trials.
          Dave

          - what a thoroughly post-modern subversion of the cycling genre -

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          • #6
            Trials Tires

            So then I would guess that any trials tire should fit. I would consider any 2 1/2 inch tire a trials tire. I don't think that BMX bikes have anything bigger that 2.1 inch. Would this be a correct assumption?

            I am a hardcore MUni rider but I am getting into trials because one I think that Trials skills will improve my MUni and two because I met a group of really nice kids who are great on Trials bikes and it is fun to ride with them. They however all have 26" weels on thier bikes. Is the 19" Trials tire a common tire? Or is it going to be hard to just walk into a bike shop and find one?

            I hate that about the 24 tires. I can only order them through the online Unicycle vendors. It just pisses me off.

            Unicorn
            Keep your eyes on the stars and your feet on the pedals, and you will accomplish great feats!

            The Unicycling Commune

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            • #7
              any 20(19)x2.5 trials will fit. On MOD bike there is a front and back, they are not teh same width (and sometimes tred pattern).

              However you are wrong about bmx tires. 20x2.25 is pretty common, there are some new 2.35s out, and there is a 3inch slick bmx tire.

              It is quite uncommon to walk into a bike shop and find a trials tire, let alone a MOD tire. Best luck is internet.
              ---
              Uneed Films

              Whats up with Street and Flat?
              the Unicycle Lab

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              • #8
                Someone can correct me here if I'm wrong, I think your only options are:

                Maxxis - creepy crawler
                Luna - Trials
                Monty (I think there are a couple options)
                Tryall - Sticky fingers (or something)
                ---
                Uneed Films

                Whats up with Street and Flat?
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                • #9
                  Originally posted by Unicorn
                  So then I would guess that any trials tire should fit. I would consider any 2 1/2 inch tire a trials tire. I don't think that BMX bikes have anything bigger that 2.1 inch. Would this be a correct assumption?

                  I am a hardcore MUni rider but I am getting into trials because one I think that Trials skills will improve my MUni and two because I met a group of really nice kids who are great on Trials bikes and it is fun to ride with them. They however all have 26" weels on thier bikes. Is the 19" Trials tire a common tire? Or is it going to be hard to just walk into a bike shop and find one?

                  I hate that about the 24 tires. I can only order them through the online Unicycle vendors. It just pisses me off.

                  Unicorn
                  About half of my local bike shops stock mod tyres, you just need to find one that is geared towards your needs, my experince is that bike shops are either intended for commuters/road bikes or mountain/bmx/trials bikes. 26" is also popular for trials, although I've never worked out why.
                  Dave

                  - what a thoroughly post-modern subversion of the cycling genre -

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                  • #10
                    Originally posted by kington99
                    About half of my local bike shops stock mod tyres, you just need to find one that is geared towards your needs, my experince is that bike shops are either intended for commuters/road bikes or mountain/bmx/trials bikes. 26" is also popular for trials, although I've never worked out why.

                    That depends on where you live and how popular trials is. I have been into 10-12 bike shops in the last year, not a single one of them had any trials anything whatsoever. ...yet
                    ---
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                    • #11
                      Trials bikes are much more popular in the UK

                      Originally posted by kington99
                      About half of my local bike shops stock mod tyres, you just need to find one that is geared towards your needs, my experince is that bike shops are either intended for commuters/road bikes or mountain/bmx/trials bikes. 26" is also popular for trials, although I've never worked out why.
                      I looked into buying a trials bike in the USA. There are like 3 shops in the whole of the states! Their are no low end Monty, Onzas etc. here. Only 3 dealers online and the bikes start over 1000$ US.
                      So the chance of walking into a bike shop here and finding a trials uni or bike tire is almost zero. You must order it online.

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                      • #12
                        Well this is off topic, however when I measured my CC it was 3 inches wide
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                        • #13
                          lol
                          i didn't read 1/2 the posts or anything but the rim size is 15", not 15.5" (you measured it differently than manufacturers do) the outer diameter of the tire is different on every tire.
                          the way tires and rims are measured is that the average tire is about 2.0 ... on a bike... the rim is always 4 inches smaller than the said size. so a 20" bike's rim is going to be 16"... or close to it. it goes on, so on and so forth.
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                          • #14
                            you definitely can not put a BMX tire on your rim. it is a mod rim, you can get a tire for around $30 and they normally last for several months. if you invest in a 15x2.5 motorcycle tire you won't have to worry about the tire popping either.
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                            • #15
                              Originally posted by jamessd
                              Well this is off topic, however when I measured my CC it was 3 inches wide
                              there is no specific way to measure a tire.
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