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7.5.6 Mounting Tubeless Tyres
Before mounting a tyre make sure it is free of dirt and lubricant on the inside
and around the beads. Do not use tyre levers!
To prevent any damage, wet both beads all around with soapy water or with
tyre mounting lubricant and press the tyre with your hands onto the rim.
Press one bead over its entire circumference over one edge of the rim and
then the second tyre bead (a). Centre the tyre in the rim. Make sure the tyre
is properly seated in the rim base and the beads lie symmetrically on either
side of the valve. Inflate the tyre with a compressor or a CO2-cartridge to
the maximum permissible pressure so that it can get seated on the rim. The
permissible pressure is usually specified on the side of the tyre.
Check whether the tyre is properly seated by inspecting the fine witness line
(b) just above the rim edge. This line should be even to the rim all around
the tyre. Starting from the maximum tyre pressure you can now reduce the
pressure through the valve to suit your needs. Please observe the recom-
mended tyre pressure range.
Tubeless tyres must be mounted on UST rims or UST wheels
(Mavic and other manufacturers) only.
7.5.7 Removal of Tubular Tyres
To remove the tubular push it a little to the side of the rim at a place opposite
the valve until a gap appears and the tyre starts to come off. If the tubular
remains stubborn, stick a plastic tyre lever into the gap and lift the tyre off
the rim (c).
After a puncture the tubular is no longer securely fixed on the
rim. Be sure to ride back very carefully by taking the shortest
route possible. Do not accelerate or brake hard! For your own
safety, have yourself picked up, if you are in doubt.
7.5.8 Mounting Tubular Tyres
To mount a tubular tyre properly so that it durably stays in place you should
take your time and proceed stepwise. A little practice and experience with
the glue (d) and tubular model you are using can speed up the job!
For your own safety, ask your bicycle dealer to mount a tubular.
a
b
c
d
Tubular tyres can be glued either with liquid tyre glue or with adhesive tape.
One advantage of using tape is that it can be done fairly quickly. However,
this may not always give a sufficiently firm bond of the tyre on the rim. In the
event of a roadside puncture the tape will often cling to the dismounted tyre
and your spare tyre may not bond to the rim sufficiently well.
A poorly glued tubular tyre can come off the rim. Risk of an
accident!
A better alternative, therefore, is to glue the tyre to a generous bed of several
layers of liquid tyre glue. Glue not only gives a firmer bond, it usually also
remains on the rim when dismounting the tyre. However, back home again
you should remove the spare tyre nevertheless. To achieve a stronger bond
you can then retreat the adhesive bed and the tyre with glue and remount
the tyre.
Tyre glues do not only stick on rims and tyres, they also cling
quite stubbornly to fingers and clothes. This makes it advisable
to wear old clothes when mounting tubulars.
When mounting a tyre on a rim that has already been used, it
may be necessary to remove glue residues and dirt with a steel
brush or with emery cloth. When you are done, wipe the rim
with a soft cloth and benzine (a).
Benzine and tyre glue should only be used in a well aired place,
since both materials are highly flammable. Keep them in a safe
place out of children’s reach!
Remove the protective valve cap and mount a valve extension, if necessary,
to the valve head unscrewed before, if you intend to mount the tyre in a deep
section rim (b). Inflate the tyre to a point where it starts to become round and
then stick the valve through the hole in the rim (c).
Starting from the valve and working in both directions press the tyre into the
rim all the way round. If you are unable to mount it completely on the rim or
if this would require excessive force, leave off trying, since it might not work
with force alone.
If this is the case the pumped up tyre must be kept on the wheel rim for a
few days. Don’t use force to stretch the tyre (d). Then check again whether
the tyre can be easily mounted.
After mounting the tubular tyre, spin the wheel and see whether the tyre
runs true. The area where the valve comes out of the tyre is often thickened
which leads to a vertical runout of the rim and makes the wheel jolt during
the ride.
a
b
c
d
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