Wednesday 14 March 2012

The TT saddle shuffle!

The TT saddle shuffle, this is my opinion on the constant shuffling that you see riders make in TT's, such as Kreuziger in Tirreno Adriatico, as in my previous blog about some riders setting their saddle height based on riding on the nose of the saddle then setting the front end of the bike based on just riding on the nose making them solid and with no movement on the saddle, i think the riders that shuffle around set their saddle height based on sitting in the middle of the saddle but base the front end of the bike based on riding on the nose, but here is the problem they start sat in the middle of the saddle but the front pulls them on to the nose of the saddle, which in affect is like lowering your saddle by up to a cm while you are riding and loosing about 5-10 degrees of leg extension, in affect loosing power, so they constantly push themselves back to gain more power (measure your own saddle from centre of BB to middle of the saddle, then BB to 2-3cm back from tip of saddle and see the difference) If a rider likes sitting in the middle of the saddle he should set the front of the bike to keep him in that position.

These are just my observations, but could be wrong and they just have a nervous twitch!

Tuesday 13 March 2012

TT saddle postion

Having watched a certain rider on the track and in tt's he never seems to sit in the saddle but on the nose of it (watch Paris Nice final tt up Col d'Eze), this may be to get his very aero position around the UCI rule that the tip of the saddle should be 5cm behind the vertical line of the bottom bracket, his bike will be within the rules, but by setting his position (saddle height/correct leg extension) on the tip of the saddle he has effectively moved the imaginary tip of the saddle in front of the BB, allowing him to ride further forward which in effect opens the hip flexers up, which allows him to get in to his very flat aero position. I think a few other teams should look at this for there own riders! Saddle height taken 2-3cm back from tip of saddle is very differant than that taken from the middle of the saddle.


These are just my thoughts and observations on this and i could be totally wrong!! But a lot of teams could learn alot from what this certain rider on their very non aero riders, but it doesn't mean that they can get in to that position!

Sunday 11 March 2012

Are you pedalling in circles?

The bike is not a leg press machine! You need to pedal in circles, think less about pulling up, but more that you are trying to get the up stroke out of the way of the down stroke, think of your leg as a dead weight, the average leg is going to be a few kg in weight (each leg is on avg 10% of your total weight), that if you don't get it out of the way as quick as poss on the up stroke you're not just pushing down to propel the bike forward, but also to lift the dead weight that is your leg.




Not everyone has the benefit of a Watt bike or spin scan software, but next time you are on the turbo after your warm up for 20-30 sec do one legged drills (un clip shoe and rest on the turbo)on each side and see if you have a dead spot in your pedal stroke, normally it will be last part of the up stroke and just over the top, but also notice when you clip both shoes in how much freer and faster your pedal stroke is because you have switched on all the muscles in the pedal stroke.


If you don't have a turbo, you could possible do this on a quite bit of road (please be safe) find a bit of road with a very slight drag, un clip one shoe and hang down, pedal one legged and wake up all the muscles through the pedal stoke, do both sides then clip both shoes back in and carry on with your ride.





Try the above not just on the hoods but on the drops as well, if you have more of a dead spot on the drops then maybe the bars are too low/or bars are at the wrong angle and the hip flexer is too closed up that you are unable to get the leg over top dead centre, also try this on tribars of your tt bike. If you can't then maybe you need to raise your bars which will open your hip flexer allowing you to get over top dead centre or even your cranks are to long (will go into this later)




I understand more since I've started bike fitting why when we were younger we were taught to use low gears over the winter, when you spend a good chuck of the winter on 42-17 or 18 (some people used a lower gear) the up stroke becomes more of a reflex action, because if you don't get the up stroke out of the way quick enough you will bounce all over the saddle, so you learn to pedal fast and smooth and 'pedal in circles'.




Crank length, people think more about this in terms of leverage, yes it may help but too long a crank will close the hip up at the top of the stroke. At the bottom of the stroke your ideal leg extension will be no different if you use 180mm cranks or 165, but at the top of the stroke you will have closed the hip up a lot more with the 180 compared to the 165 cranks. With a shorter crank the other benefit is you can get lower and more aero because there is more room in the hip flexer area. This is also of benefit to triathletes, especially ironmen, the more open the hip flexer the easier the tradition from bike to run. Kona Ironman winner 2011 Craig Alexander (who is 180cm tall) used 167.5mm cranks for fastest bike split (I think!)