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Road Uni Tire Clearance?

Started by Erin · · Last activity · 8 posts · 276 views

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01 / Original postRoad Uni Tire Clearance?Erin · 30 Dec 2004 02 / This pagePosts 1–8Page 1 of 1 · chronological order 03 / Latest replyPost #8Mikefule · 28 Jun 2005

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Original section
rec.sport.unicycling
Published
30 December 2004
Last activity
28 June 2005
Original author
Erin
Posts
8
Discussion status
Public discussion
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276
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0
Topics
Wide tyres

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  1. Original post
    Erin
    Archived post
    #1

    Here's a general question about clearance between the frame and the tire
    on a uni intended to be riden on the road.

    In searching in the archives for information on tire clearance I came
    across quite a bit of discussion with regards to clearance for MUni
    tires both under the crown and along the forks. But I haven't read much
    about is clearance for, say a Big Apple on a 29'er frame.

    Of course less clearance would be necessary between frame and tire for a
    uni that will not be encountering mud and loose riding surfaces. So
    what set up are you riding on the road and how little clearance are you
    getting away with? Do share.

    --
    Erin - Onewheeler

    Ride more, with less.
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  2. UniBrier
    Archived post
    #2

    If it don't rub you got enough clearance.

    That's probably true for the Big Apple and smooth road tires. I've got
    Blue Shift on loan from Harper with a Big Apple. It's clearance is so
    tight you can't see daylite between the crown and tire. Its picked up
    some road grit but nothing that affects performance.

    A tire with more aggressive tread may pick up more stuff than the B.A.

    Fortunate for you the B.A. is as big as it gets.

    --
    UniBrier - Its Time to Ride

    Steve

    You are never too old to set another goal or to dream a new dream. - C.
    S. Lewis

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  3. sarah.miller
    Archived post
    #3

    Paper hin clearence is OK on a road tyre so long as you watch WHAT your
    riding in! new laid or really soft in the sun tar and chippings can
    cause a problem, even with a bigger clearence. I had a face plant from
    the coker thanks to picking up a tarry chipping like that on the C2C
    ride the other year!

    SArah

    --
    sarah.miller - unicycist
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  4. DigitalDave
    Archived post
    #4
    sarah.miller said:

    * I had a face plant from the coker thanks to picking up a tarry
    chipping like that on the C2C ride the other year!

    SArah *

    Yikes! 🙁

    --
    DigitalDave - scabless

    'nf7-s ~ xp2400mobile'
    (http://www.anandtech.com/mysystemrig.html?rigid=21988)
    '19,774 3dm01' (http://service.futuremark.com/compare?2k1=8304204)

    my will to live was stronger than my will to die - iggy pop
    what doesn't kill you, only makes you stronger - i dunno 🙁
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  5. Erin
    Archived post
    #5
    sarah.miller said:

    *Paper hin clearence is OK on a road tyre so long as you watch WHAT
    your riding in! new laid or really soft in the sun tar and chippings
    can cause a problem, even with a bigger clearence. I had a face
    plant from the coker thanks to picking up a tarry chipping like that
    on the C2C ride the other year!

    SArah *

    Double Yikes!!

    --
    Erin - Onewheeler

    Ride more, with less.
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  6. roadkill
    Archived post
    #6

    Sorry to pick-up on an old thread, but this one is interesting.

    It seems that a few are suggesting that paper thin clearance is fine for
    the road.

    I have found that tire dimensions can change quite a bit from cold
    (before a ride) to hot (after riding awhile). The Big Apple is a large
    volume tire and expands a bit after turning the cranks for a few miles.

    I was going to take a few pics for illustration but found this gallery
    that pretty well shows it (center photo and text):
    'Here' (http://gallery.unicyclist.com/bigapple)

    --
    roadkill - Crash Test Dummy

    " Eagles may soar, but weasels don't get sucked into jet engines. "
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  7. Mikefule
    Archived post
    #7

    Several considerations. Would you want your uni to be restricted to
    tarmac and concrete by the tyre clearance? All my unis get ridden
    across rough ground and muddy paths from time to time.

    If a tyre picks up mud and grit, it will at the very least scratch the
    inside of the fork. At worst, it will cause damage, or a UPD.

    And few wheels stay perfectly true forever. If you have minimal
    clearance, then you will be stuffed if you put the slightest kink in the
    wheel.

    Also, a uni frame can flex considerably under heavy pedalling - e.g. up
    or down hill. I've heard my Coker tyre whiffing against the inside of
    the forks from time to time.

    So, rule of thumb? I wouldn't be happy if the gap between the tyre and
    the fork was too small for me to pass my finger tip through. OK, that's
    a rule of finger.🙄

    --
    Mikefule - The first cuckoo of unicycling

    Sumer is icomen in, loud sing Mikefule!
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  8. Mikefule
    Archived post
    #8

    Several considerations. Would you want your uni to be restricted to
    tarmac and concrete by the tyre clearance? All my unis get ridden
    across rough ground and muddy paths from time to time.

    If a tyre picks up mud and grit, it will at the very least scratch the
    inside of the fork. At worst, it will cause damage, or a UPD.

    And few wheels stay perfectly true forever. If you have minimal
    clearance, then you will be stuffed if you put the slightest kink in the
    wheel.

    Also, a uni frame can flex considerably under heavy pedalling - e.g. up
    or down hill. I've heard my Coker tyre whiffing against the inside of
    the forks from time to time.

    So, rule of thumb? I wouldn't be happy if the gap between the tyre and
    the fork was too small for me to pass my finger tip through. OK, that's
    a rule of finger.🙄

    --
    Mikefule - The first cuckoo of unicycling

    Sumer is icomen in, loud sing Mikefule!
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