One winter with the Tektro Lyra
I built a new winter-commute bike and used it now one season.
For the front I used a Mavic Speed City with Tektro Lyra disk brake;
here is the report.
I used this brake with Shimano Ultegra levers and ordered it with an
in-line Travel Agent. When it all arrived and I began fiddling with it,
measuring the throws and experimenting, I decided I didn't want the
Travel Agent. I read the docs that came with the thing a second time
and experimented a little more and went ahead and built it without it.
I had no trouble mounting the brake. I just experimented with the mounting
hardware trying to get the center of the pads aligned over the quite narrow
disk surface. The Lyra does not have much width to the disk, I think getting the
center of the pads a little too far inboard would cause unacceptable pulsation.
The disk itself was perfectly true as far as I could measure with a straightedge.
I had no trouble getting the mounting to line up. Lever release definitely caused
daylight between the disk and pads, no problem there.
So how was it for the first winter? The braking power of this thing is adequate but
not impressive. I would say it is a little less powerful than a caliper, that is, with my
setup, I have to squeeze maybe 1/4 harder than I would on my summer bike with
the same levers and a caliper. There is no pulsation. One thing is, for some reason,
after say half an hour of riding in the winter saltbrine the next stop I get an almighty
howl from the brake for the first second or so. It seems to be the salt; once it's clean
it's fine. The action is predictable, pleasant, and easy to modulate. The disk has not
shown an iota of rust in spite of the witches brew the highway department uses around
Basically, the thing is a success. I am quite sure I did the right thing in omitting the
Travel Agent as the 2:1 step-up would double the hand pressure, and as noted, it
requires somewhat more than a caliper already. The manual calls for "a lever capable
of 24 mm of travel", well, that's more than a standard road setup gets you, but at least
in my case, I really don't need it. My setup would not be tolerant of excessive slop in the
system, but that has not been a problem; the travel available is more than enough to get
the pads clear of the disk. When I squeeze, the lever pretty much stops in about half
the travel available. I have had one emergency stop (left turning car). The rig howled to
a stop no problem with plenty of travel left. One other thing: if you look at the mechanism,
I don't see how it could use 24mm of travel at the business end. I guess the admonition in
the manual assumes some of the travel will get eaten up stretching cables and compressing
housings, and the rest is for the lawyers.
I am using the Lyra only on the front with 80 cm of wire. I use a caliper on the rear, and I
dont know if I could get away with the same trick there if I installed a Lyra there, since it
would take 140 cm of wire and there would be more spring and slop in the system. As it is
though, the front disk and rear caliper brakes seem harmonious.
When I mounted the brake, I exchanged all the bolts they sent me for stainless steel, this
is after all, a winter bike. The brake feels basically, good. The worse part is that first honk
if I pull a hard stop on a dirty day, but then back in January when the car cut me off, it was