Time Trial / Time Trialling / TT

i dont have the foggiest why it would appear to be 2hrs. I get the maths, i was just trying to work out the physics.

the argument about doing the hills faster because your going slowest on them longest seems good too. my point was more about wether it makes sense from an energy efficience point of view too. its all well and good to say you should try harder on the hills/headwinds, unless the boost to your speed is gonna be relatively small compared to the extra effort. is the exponentially increasing air-resistance in a head wind ever going to make the extra effort a waste, better spent evenly across the whole course?

sure, what i'm saying is that if two riders covered a course in exactly the same time but the first sprinted up the hills and the second sprinted down them the first rider would have used less energy. This is the reason riding hard on the climbs gets you a better time. Or am i confused? Here is another example...

if your riding a course with a head wind and a tail wind section which is totally flat is there any reason why you should vary your effort at all? You want to minimise your total effort, the only serious resistance to your movement is your speed relative to the air so surely you would aim to ride steady throughout so you were slower into the headwind and faster with the tail wind. Is there any physical advantage to riding harder into the head wind to avoid going slowly at that point?

Riding faster up hills uses MORE energy but you ride the course quicker. The idea is you should ride the harder parts a little bit harder and back off a little bit on the easier (tailwind, downhill) parts. Unless you're quite good at knowing your perceived exertion or watching a power meter it's usually best to stick with steady state. Lots of people will overcook things like climbs and then be forced to soft pedal descents.

if your riding a course with a head wind and a tail wind section which is totally flat is there any reason why you should vary your effort at all? You want to minimise your total effort, the only serious resistance to your movement is your speed relative to the air so surely you would aim to ride steady throughout so you were slower into the headwind and faster with the tail wind. Is there any physical advantage to riding harder into the head wind to avoid going slowly at that point?

Yes, because the headwind section is harder and will take you longer to complete. So, says it's a 10mi, then you spend 60% of your time riding into a headwind and 40% of your time flying back with a tailwind. So, it's better to ride a bit harder into the headwind to get it done quicker, even if you ride the easier, tailwind section slower.

Every time I got to richmond park, it's for an easy spin. Every time I'm going up the little drag westbound and 4 or 5 people I've over taken on the flat come past me at some speed. I'm doing the same watts I was on the flat, but now uphill. They're now pushing well into oxygen debt and 200 more watts than they were on the flat.

Some people don't know any better.

So, it's better to ride a bit harder into the headwind to get it done quicker, even if you ride the easier, tailwind section slower.

thanks hippy/danb, its interesting. i definitely try to do what your suggesting when i race but I just wondered if it was always the best tactic. it didn't seem totally obvious that the the same tactic was going to be best for all conditions, but maybe it is.

its a fine balance though but generally the extra effort on the harder bits (up hill / into headwind) is always worth it (until you go too far and knacker yourself....) :)

That's where the trick lies :)

Pacing, you fickle bitch.

You are Ed Scoble AICMFP

I believe a 'tri' setup is moving the saddle forward to ease the hamstrings.

Moving the saddle forwards opens up the torso-thigh angles so you can achieve an aerodynamically good position without compressing the abdomen and limiting the movement of the diaphragm.

http://www.bikeradar.com/fitness/article/technique-why-hip-angle-is-crucial-when-using-tri-bars-28947/

Triathlon thread >>>

Fertility thread ?

What's hip angle got to do with fertility? Pelvic thrusts per minute?

Can someone work out how much distance I'll gain over 24 hours riding an 808FC clincher front versus a SRAM S80 clincher front? Then divide that by the £900 or so they cost? Many Thanks.

Could do... Though you're probably better off buying 50 quid worth of dexies.

Have you considered renting?

Could do... Though you're probably better off buying 50 quid worth of dexies.

They're on the banned list. 808s aren't.. yet.

Have you considered renting?

I did, but for a HED disc. Not seen that site before. Ta

Speed.

Shame it's a nice tub going on, or I'd ride it around town.

What a tool: DNS.

Signed-on early, timed my warm-up to perfection, then got nattering in the car park and missed my start.

Hey ho: a lesson learned...

May do my first TT (10) tomorrow (depending on when I get off work) or if not tmw then Tuesday...

What are my options for front aero skewers? (Available int he UK?)

Ala; http://www.shop.view-speed.com/View-Speed-Series-3-Skewer-S3-610098715894-S3.htm

Which wheels? Steel QR axles will take an M6 tap, then you just need a couple of countersunk screws (I use 12.9 grade, because why not?) and some cup washers, see https://www.lfgss.com/post2788491-110.html for an illustration

Knew you'd know!
The hed above. That's a smart Methord.

So you cut down a QR? It's M6 already or you then tapped the ends to M6?
Put the 2 countersunk screws each side for spacing?
Then the cupwasher, to put a Allen key bolt into?