Filter
Top Products
38
HP
Velotechnik
Chain tubes
The chain protection tubes consist of Teflon, a
long lasting plastic, that features very low fric-
tion, slow wear and good noise damping.The
tubes protect your clothes against the chain oil
as well as the chain against dirt from the road.
The upper tubes are fastened with an inter-
changeable retention spring, the lower tube
runs through an adjustable clip.
The tubes are worn by the chain and have to
be cut at the ends and expanded again (or ex-
changed) after 3.000-5.000 km approximately,
depending on how many kilometers have been
ridden, on the chain type and the overall riding
condition.You can extend this maintenance
interval by turning the tubes by a quarter turn
from time to time so that they do not keep
wearing out in the same place.
The intensity of the wear depends mainly on
the chain type. Please see also the instructions
on "Chain" on page 36.
In order to perform any work at the chain tu-
bes you'll have to open the chain and finally
close it again. Please see the instructions on
"Chain" on page 36.
Expanding the tube ends
The ends of the tubes are expanded like a
trumpet so that the chain can enter smoothly
without friction and without making noises.
When the ends are worn out you can renew
them through expansion. Remove the chain by
opening the power link or open it with a spe-
cial chain riveting tool. Cut the worn part of
the tube exactly perpendicular with a sharp
knife.
Heat the last 5-10 mm at the end of the tube
with a gas burner or a candle and turn it per-
manently until the color of the utmost edge
turns from a dull black to a shiny black. Now
you expand the end with a proper tool, e.g.
the rounded grip of a screwdriver. Quench the
expanded end immediately with cold water.
Take care that the tubes don't catch fire since
burning Teflon develops toxic vapors.At any
rate, work in a place with sufficient ventilation.
If the tube is too short after you have cut it so
that there is not enough protection anymore it
has to be replaced.You can buy spare tubes
either as uncut tubes or already cut into the
correct length, complete with retention spring
from your specialist dealer.
Chain Tubes
Caution! Take care that the chain tubes
keep at least a 5 cm distance to the rear and
front derailleur when the chain is stretched
to the maximum, and that the tubes are well
fastened. If necessary you will have to shor-
ten the tubes. If the end of a chain tube gets
into the rotating drive train it can be blok-
ked and the chain tubes may be destroyed.