Dandelion RubberOctober 30, 2019
Athena Gasket SetsJanuary 19, 2020
Fitting Procedures for
Tubeless Ready MTB Tyres. The Pro Race
- Lubricate the tyre beads
all round with soapy solution to minimise tyre rubber/wheel rim friction . Fit
the tyre and inflate to 3-4 bars to ensure good contact between the tyre bead
and rim. This is best done with UST valves with a changeable insert which
allows compressed air to enter the tyre rapidly and pop the tyre beading into
place under the rim crotchets. The new generation Conti tyres will seat in most cases with hand
pump inflation and without the need for compressed air.
- Pre-sale folding of a tyre
can cause uneven seating of the tyre and it may be necessary to fit an inner
tube which will force the tyre to seat evenly around the wheel rim. Afterwards loosen the tyre bead on one side
and remove the tube. Rim tape should be centred exactly in the rim bed to prevent
the tyre bead from seating on the rim
tape which could cause uneven concentricity (tyre wobble) and air loss between
the bead and wheel rim. Thick or incorrect rim tape can result in difficult (or
even impossible) fitting of a tyre
- Deflate the tyre and
unseat the bead on one side to insert sealant into the tyre
- Re-inflate to 3-4 bars and
then bounce the tyre while rotating to ensure the beads are tightly and evenly seated
around the entire circumference of the wheel.
- Hold the tyre flat (ie
parallel to the ground) and rotate first one side then the other to spread
sealant evenly on both sidewalls. Now lie the tyre flat on one side for 15
minutes and repeat for the other side
- Initial air loss through
sidewalls can occur but cease once the sealant impregnates casing material
evenly and settles down. This can take up to 2- rides and sometimes may require
the addition of another 20 to 50ml of sealant.
- Thick or incorrect width
rim tape can result in difficult (or impossible) fitting and or seating of the
tyre and can result in the tyre unseating from the rim during riding.
- Sub standard wheel rims
with run-out issues or wheels which are slightly over or under the ETRTO
specifications can cause seating problems. Most premium tyres are manufactured
to fit wheels which comply with the ETRTO spec. Conti find that Shimano and
Mavic wheel rims are generally very
accurate in ETRTO compliance and can be used as a bench mark for assessing tyre
quality and compatibility.
Adherence to the above procedures will result in tyres
which are correctly seated and sealed.
Dynamic handling and performance in all conditions is greatly improved while
puncture resistance, tyre life, and overall safety is maximised and tyre costs are