Suspension is the key! Yes that's right put springs on
your shoes. Well, not quite, but while on the subject of shoes
you need to make sure you use one with good shock absorption
qualities - stay away from running flats, they don't have
the support and absorption qualities to be kind to your joints.
In any event they are only meant for shorter endurance events.
Anyway, I really mean suspension for the bike.
Softride are the most well known suspension
beam bikes. I've included a couple of their frames below.
There are variations on this type of design. Zipp had a beam
bike too, originally they used the Softride suspension beam
(originally called the Allsop suspension beam), but they moved
to a different beam but it still would provide shock absorption.
Trek too have a suspended beam design bike, this is their
Y66 model for triathlon, which no longer appears to be marketed,
though it may still be available as a special order.
The Trek Y66 Trek now market their Hilo
range as triathlon specific.
It is not necessary to go to the expense
of changing frames to get suspension, as there are now a range
of quality lightweight suspension seat posts. Both USE and
RockShox make good suspension posts, both road versions come
in at around 300g. If anything USE's is a shade lighter. I
actually train on a Softride and race on a Trek OCLV carbon
fibre frame with a USE RX Shokpost. Carbon fibre frame material
is also a little more compliant than aluminium.
Pictures of some suspension seat posts are
just below the Softride frames.

The Trek Y66

The original Softride beam design

The new Softride beam design
RX Shokpost 294g 1.5" travel

XCR Shokpost 356g 2.3" travel

SX Shokpost 374g 2.1" travel

Rock Shox seat posts
Aluminium frames are very stiff and transmit
every bit of road shock to the rider's pelvic area (no good
for arthritic hip joints). Which will in time have an effect,
a negative one. From my own experience within three months
of riding an aluminium frame I developed acute pain in my
arthritic hip and found climbing, out of the saddle, excruciating.
That problem was eliminated by adding a suspension post. I
can still ride a rigid post in an aluminium frame but only
infrequently and depending on the road surface for distances
between 40 -100km.
Now there are even suspension saddles on
the market which again may eliminate the need to buy a suspension
seat post. Koobi manufacture a model called the PRS which
they claim specifically eliminates the need for a suspension
seat post [Triathlon & Multi Sport Magazine Vol. 6 No.
4, April 2003, Melbourne Australia, p.35]. Selle Italia also
make a saddle that absorbs shock too. It is called the Octavia.
Of course any equipment that makes you go
faster for less effort has got to help the overall stress
you place on your joints. So the nice to have things like
race wheels are going to benefit you just like everyone else.
Of course these toys for the bike don't come cheap but they
are very nice to have. Look at things like aerodynamic changes,
which includes not just wheels and aero bars but overall bike
position and even the frame profile. In non-drafting triathlon
the choice of frame design is not limited by UCI rulings (ITU
only adopted them for draft permitted triathlons, like formula
1, which are for elite triathletes only), so you can experiment
as much as your budget allows. Just remember in any positional
changes to accommodate any constraints that you have due to
injuries. Comfort has to be included.
Changing
Sports
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