While hard at work the other day I happened across a new mod trials bike
about to come out… with a 20x3" rear tyre. I’ve just had confirmation
from the retailer that it will indeed be 3" wide although whether it is
exactly 3" wide remains to be seen… 2.75 more likely. The exact
specifics of sizes and who is making this new tyre is unknown as yet.
The only problem is that I don’t know if there’s any 20" frames wide
enough to take such a tyre. If anyone’s involved in developing 20" trials
frames then they might like to keep this baby in mind when doing the
measurements.
After some very quick measurements I think this tire may fit into my Sem
Deluxe 20", which has 3.5" of width clearance. If this tire is 3" wide,
that leaves .25" from each side of the frame. If I measure .25" from the
side post of the frame, starting from the top of the rim up until it
touches the top of the frame, I get a required clearance of 2.5". So if
this tire is 3" wide and is less than 2.5" at each tire edge (from rim to
top of tire), then the tire will fit. The top of the sem frame is a
triangle, so the outer tire edge clearance is the constraint.
In comparison, my 24 x 2.6" Kenda Kinetic tire is 2.5" wide and 2.1" high
from the rim to the top of each tire edge.
Ratio wise a 24 x 3" tire is the equivalent to a 20 x 2.5" tire, or a 26 x
3.25" tire. A 20 x 3" tire would be equivalent to a 24 x 3.6" tire or a 26
x 3.9" tire! Yes, the math is crude.
That’s some massive tire!
The widest 20" tire I can find is 20 x 2.25", made by a number of
manufacturers. Now we may see a 20 x 3.0"? Isn’t there something in
between? 0.75" is a large gap between tire widths.
Neil Dunlop wrote: > > While hard at work the other day I happened across a new mod trials bike > about to come out… with a 20x3" rear tyre. I’ve just had confirmation > from the retailer that it will indeed be 3" wide although whether it is > exactly 3" wide remains to be seen… 2.75 more likely. The exact > specifics of sizes and who is making this new tyre is unknown as yet. > > The only problem is that I don’t know if there’s any 20" frames wide > enough to take such a tyre. If anyone’s involved in developing 20" > trials frames then they might like to keep this baby in mind when doing > the measurements. > > The original add: http://www.singletrack.co.uk/acatalog/Singletrack_Onl- > ine_Da_Bomb_Trials_Bike s_47.html > > More photos from the manufacturer: > http://www.dabombbike.com/htm/news/news.htm > > Cheers, Neil
A 3.0" tire will also fit the Kris Holm 20" trials unicycle when it
comes out.
-K. — Don Tai <Don_Tai@yahoo.co.uk.fake> wrote: > Cool tire. > > After some very quick measurements I think this tire may fit into my Sem > Deluxe 20", which has 3.5" of width clearance. If this tire is 3" wide, > that leaves .25" from each side of the frame. If I measure .25" from the > side post of the frame, starting from the top of the rim up until it > touches the top of the frame, I get a required clearance of 2.5". So if > this tire is 3" wide and is less than 2.5" at each tire edge (from rim > to top of tire), then the tire will fit. The top of the sem frame is a > triangle, so the outer tire edge clearance is the constraint. > > In comparison, my 24 x 2.6" Kenda Kinetic tire is 2.5" wide and 2.1" > high from the rim to the top of each tire edge. > > Ratio wise a 24 x 3" tire is the equivalent to a 20 x 2.5" tire, or a 26 > x 3.25" tire. A 20 x 3" tire would be equivalent to a 24 x 3.6" tire or > a 26 x 3.9" tire! Yes, the math is crude. > > That’s some massive tire! > > The widest 20" tire I can find is 20 x 2.25", made by a number of > manufacturers. Now we may see a 20 x 3.0"? Isn’t there something in > between? 0.75" is a large gap between tire widths. > > Don_TaiATyahooDOTcoDOTuk, Toronto, Canada > http://torontounicyclists.tripod.com > > Neil Dunlop wrote: > > > > While hard at work the other day I happened across a new mod trials > > bike about to come out… with a 20x3" rear tyre. I’ve just had > > confirmation from the retailer that it will indeed be 3" wide although > > whether it is exactly 3" wide remains to be seen… 2.75 more likely. > > The exact specifics of sizes and who is making this new tyre is > > unknown as yet. > > > > The only problem is that I don’t know if there’s any 20" frames wide > > enough to take such a tyre. If anyone’s involved in developing 20" > > trials frames then they might like to keep this baby in mind when > > doing the measurements. > > > > The original add: http://www.singletrack.co.uk/acatalog/Singletrack_O- > > nline_Da_Bomb_Trials_Bike s_47.html > > > > More photos from the manufacturer: > > http://www.dabombbike.com/htm/news/news.htm > > > > Cheers, Neil
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> Cool tire. > > After some very quick measurements I think this tire may fit into my Sem > Deluxe 20", which has 3.5" of width clearance. If this tire is 3" wide, > that leaves .25" from each side of the frame. If I measure .25" from the > side post of the frame, starting from the top of the rim up until it > touches the top of the frame, I get a required clearance of 2.5". So if > this tire is 3" wide and is less than 2.5" at each tire edge (from rim > to top of tire), then the tire will fit. The top of the sem frame is a > triangle, so the outer tire edge clearance is the constraint.
I’m only guessing here but I’d imagine this new tyre will be very close on
a Monty in that the outer diameter is still 20 inches but it uses a
smaller rim. So the main clearance factor will be the width between the
forks. Only guessing though.
> In comparison, my 24 x 2.6" Kenda Kinetic tire is 2.5" wide and 2.1" > high from the rim to the top of each tire edge. > > Ratio wise a 24 x 3" tire is the equivalent to a 20 x 2.5" tire, or a 26 > x 3.25" tire. A 20 x 3" tire would be equivalent to a 24 x 3.6" tire or > a 26 x 3.9" tire! Yes, the math is crude. > > That’s some massive tire! > > The widest 20" tire I can find is 20 x 2.25", made by a number of > manufacturers. Now we may see a 20 x 3.0"? Isn’t there something in > between? 0.75" is a large gap between tire widths.
There’s the Monty and Onza which are both rated at 2.5. Megamo (not too
sure on the spelling) mod bikes use a Plasmatic tyre on the rear which is
2.5 I think.
cheers, Neil
> > Don_TaiATyahooDOTcoDOTuk, Toronto, Canada > http://torontounicyclists.tripod.com > > Neil Dunlop wrote: > >> > >> While hard at work the other day I happened across a new mod trials
bike > >> about to come out… with a 20x3" rear tyre. I’ve just had > >> confirmation > >from > >> the retailer that it will indeed be 3" wide although whether it is > >exactly > >> 3" wide remains to be seen… 2.75 more likely. The exact > >> specifics of > >sizes > >> and who is making this new tyre is unknown as yet. > >> > >> The only problem is that I don’t know if there’s any 20" frames wide > >enough > >> to take such a tyre. If anyone’s involved in developing 20" trials > >frames > >> then they might like to keep this baby in mind when doing the > >measurements. > >> > >> The original add: > >> > >http://www.singletrack.co.uk/acatalog/Singletrack_Online_Da_Bomb_T- >rials_Bik
e > >> s_47.html > >> > >> More photos from the manufacturer: > >> http://www.dabombbike.com/htm/news/news.htm > >> > >> Cheers, Neil
— Jeff Lutkus <lutkus@unicyclist.com> wrote: > Kris, > > I was not aware of your 20" trials frame. Is this to be the same frame > as the 24" only with a shorter fork, or are there other differences?
It will be identical to the 24" except with a shorter fork length. I’ve
been riding this 20" for about a month now and it seems to work really
well- strong but not heavy. It is AWESOME to finally have a 20" uni with
strong cranks! (145mm Profiles).
The two models will be the KH20 and the KH24.
-Kris.
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I have to ask (I was the kid who always asked “How long 'til we get
there?”) is the KH20 going to be ready any time near the KH24?
I’ll second the round of applause for the 145 Profile setup. I got one
the other week and LOVE (underlined if it were possible) is not too
storng a word
Neil
> It will be identical to the 24" except with a shorter fork length. I’ve > been riding this 20" for about a month now and it seems to work really > well- strong but not heavy. It is AWESOME to finally have a 20" uni with > strong cranks! (145mm Profiles). > > The two models will be the KH20 and the KH24. > > -Kris. > > __________________________________________________ > Do You Yahoo!? Get email alerts & NEW webcam video instant messaging > with Yahoo!
Messenger > http://im.yahoo.com
> I have to ask (I was the kid who always asked "How long 'til we get > there?") is the KH20 going to be ready any time near the KH24?
an estimated retail price would be good info too. I was considering a
united setup… but, well, gliding is the coolest thing I’ve learned to
date, so I’d like to have a frame that helps with that.
> I’ll second the round of applause for the 145 Profile setup. I got one > the other week and LOVE (underlined if it were possible) is not too > storng a word
Have people really been going through hubs and cranks on 20" unis that
much? I figure with a small crank length (relative to a muni) you have
less torque on landing, and a smaller chance of breaking things. Of
course, I’m not making jumps that even approach the pros.
> >> I have to ask (I was the kid who always asked "How long 'til we get > >> there?") is the KH20 going to be ready any time near the KH24? > > an estimated retail price would be good info too. I was considering a > united setup… but, well, gliding is the coolest thing I’ve learned to > date, so I’d like to have a frame that helps with that.
Aside from the strength the flat crown is a major factor for me too. Not
because I can glide but I’d sure like to learn.
> > >> I’ll second the round of applause for the 145 Profile setup. I got > >> one the other week and LOVE (underlined if it were possible) is not > >> too storng a word > > Have people really been going through hubs and cranks on 20" unis that > much? I figure with a small crank length (relative to a muni) you have > less torque on landing, and a smaller chance of breaking things. Of > course, I’m not making jumps that even approach the pros.
Going through hubs hasn’t been a problem for me. My original Monty has a
Suzue hub and it’s held up good and proper so far. Cranks have been a
different story though. Aside from getting through learning to roll out
of drops and pulling the seat out when that’s not possible I’ve yet to
hear of any cotterless cranks that are both strong and short enough to
take the abuse for any length of time. This is my main reason for the
Profile setup. It’s opened up a new world of things to ride on (or rather
off) because you know you’re not going to bend your cranks. Doh! I’ve
said it now
One weight saving tip for a Monty / Profile setup - the hub and cranks are
a good bit heavier than their cotterless counterpart. The Monty X-Lite
tyre is reputed to be 25% lighter than the all black version due to having
much thinner sidewalls. Apart from that it’s the same tyre. You do need to
ride at a higher PSI though.
> People are breaking cranks for 20" unis like crazy. The only cranks > that will hold up for any length of time are the bicycle euros (125mm) > or the miyata > (125mm) cranks. The aluminum ones are especially bad. Even if you are > doing small drops these cranks will not hold up. > > -Dan
Ah… I guess the fact that I’ve been using bicycle euro 125mm cranks, and
not making drops greater than 4’ (on my 20x1.75 tire, heh) explains
something. Hmm, now I wonder how much of an adjustment 145mm cranks would
be from that.
