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96
WHEELS
PUNCTURE
REMOVING TUBULAR TYRES
Deflate the tyre completely. To dismount the tyre,
start opposite the valve by pushing the tyre to the
side until a gap appears and the tyre starts to come
off. If the tyre remains tight, stick a tyre lever into the
gap and lift the tyre off the rim.
Replacing an individual tube is impossible. Instead
you have to mount a complete tubular tyre. En route
the tyre cannot be glued and is consequently not tight
on the rim even when inflated.
Therefore, be sure to ride back very slowly and care-
fully by taking the shortest way possible. Back home,
you have to glue the tubular tyre, as described in the
following.
MOUNTING TUBULAR TYRES
To mount a tubular tyre properly so that it durably
stays in place you should take yourself some time
and proceed stepwise. A little practice and experi-
ence with the glue and tubular model you are using
can speed up the job.
Tubular tyres can be glued either with liquid tyre glue
or with adhesive tapes. 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 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 re-
mains on the rim when dismounting the tyre.
Roll off the tyre until there is a gap
Use a tyre lever to remove the tyre
Tubular tyre glue
If your bike has carbon rims, you have to
i
use special tubular tyre glue (e.g. from
Continental). Be sure to read the operating in-
structions of the manufacturer of tubular tyre
glue for carbon rims before applying it.
A poorly glued tubular tyre can come off
the rim. Risk of an accident!
Nevertheless, you should still remove the spare tyre
again after completing your tour. To achieve a strong-
er bond you can then retreat the adhesive bed and the
tyre with glue and remount the tyre.
If your wheels have very high rim edges, unscrew the
valve core from the valve with special mounting tools
and mount a valve extension instead. Then screw the
valve core into the extended valve. Now you can in-
flate and deflate the mounted tyre via the extended
valve in the usual way.
Inflate the tyre to a point where it starts to become
round and then stick the valve through the hole in the
rim. Starting from the valve and working in both di-
rections 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.
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. Remove the burrs from
the valve hole of an aluminium rim or countersink it
with a big drill, a triangular scraper or a round file. If
you have carbon rims, be careful when removing the
burrs from the hole edge with a round file. Insert the
file only from the outside to the inside and not vice
versa, otherwise the fibres of the synthetic matrix
might fray out. Seal the area with instant glue sub-
sequently. This pretreatment will lead to an improved
valve fitting to the rim. If time permits, you can leave
the unglued tyre inflated on the rim for a few days to
make the final mounting easier.
Clean the base of the rim from any grease or oil using
a rag soaked in spirit or benzine.
PUNCTURE
WHEELS
97
Mounting the valve extension
Checking the true running with brake
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
i
already been used, it may be necessary
to carefully remove glue residues and dirt with
emery cloth. Be careful not to damage the carbon
material. When you are done, wipe the rim with a
soft rag and benzine.
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.
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