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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?

isn't the 'never ride slow' point suggesting that you need to measure your efforts to have greatest effect. You want to aim to never go into the red but if you are going to your better off working hard on a hill than a decent. This is because friction/air resistance increases exponentially with speed but gravity is always the same?

Riding as close as possible to your average speed for the duration of the event is most efficient with regard to friction/air-resistance. Riding slow and then riding fast and then slow again is worse
.

i just got a blackburn mtn and am please with it, its not pretty but is pretty sturdy. I just strapped a back pack to the top of it but would be interested in better bags for it.

yup. the listings are up to date, the pictures aren't. sorry!

How many miles/months/crashes on open pros?

Lots/Lots/1

I got them in 2008 but i have no idea how many miles. The Crash didnt seem to affect them, it was a while ago and i've used them for a touring trip with full panniers since then. Even so these are old rims but i thought they might be of use to someone - maybe for a hack bike, pub bike, polo bike etc.

Pictures and Specialized turbo gum wall tyres added.

New items and price drops, photos to follow

WHEEL: Campag Mirage 36h front on worn Mavic MA3 DT spokes £5

Nope.

Pictures?

if they are there next week i'll ask them about it, maybe point them here to explain.

I know aero road bikes aren't meant to be pretty, they are meant to be aero but that paint job can >>>>>>>>>>>>>>

they could have at least painted the fork black to hide the ugly gaps around the front brake.

This looks better though:
http://www.bike-discount.de/shop/a70819/nano-50-plus-steady-auto-led-front-light.html?lg=en&cr=GBP&cn=gb&gclid=CNaVh9SFgrgCFVMftAodHGwA0Q

energy, electricity, power, choice: life.

i want to be able to chart my entire 7+ day tour on GPS. my touring build has a dynamo front hub. i want to take advantage of this rather than use a solar charger like this or a powermonkey extreme.

i don't care if i charge while the GPS is in use, or when not in use.

the PedalPower Super-i-Cable looks like it will do the job, as detailed here. as would the universally praised Busch & Muller E-Werk. however both cost a bomb (the same as/ more than the powermonkey extreme).

a similar, cheaper product is the BioLogic ReeCharge Power Pack combined with the ReeCharge Dynamo Kit. however reviews are mixed.

the BioLogic website helpfully details that the ReeCharge Power Pack requires "Input current: Less than 1A and 5V max".
the hub i have, Shimano DH-3N80, outputs at 6V. which suggests they would be incompatible when used together. hence the ReeCharge Dynamo Kit.

the ReeCharge Dynamo Kit is $30. the ReeCharge Power Pack is $100 and provides 1600mAh.
all of the devices mentioned above use lithium polymer batteries.
is there any reason why i couldn't use something like this PowerGen External Battery which provided 5200mAh?
like the ReeCharge Power Pack, it requires "Input: DC 5V / 1000mA": exactly the same.

does anyone use a dynamo, or any of the mentioned products?

There are several cheaper options on evilbay
http://www.ebay.co.uk/bhp/dynamo-usb

They might not all be shit.

I'm not sure if your extremely pessimistic or you've had some cassette related mid-tour disaster in the past but either way i'm impressed your prepared to carry so many tools.

cassette tool
chain tool
chainwhip

maybe consider using the HED lolipop, i'm pretty sure i read somewhere that its a more aero solution than arse mounted bottle cages.

wow 3 years of no activity since i started this thread and now just look at it go :-)

Aren't people starting to wonder whether shoecovers actually save any time? Increase in A vs (alleged) decrease in D.

stupid question time, what is A and D? Drag?

http://www.olafureliasson.net/publications/your_rainbow_panorama.html

I visited this art gallery in Aarhus, Denmark last week:

The rainbow walkway on the roof is breathtaking, both when inside it and when it appears illuminated by the sun from street level.

Thanks for the update ShannonBall, sorry i wasn't there to help out. Its such a shame things didn't go exactly to plan but i'm sure the rest of the event was great.

Thanks also to you and the others from Islington CC who put so much effort in.

I wonder how the safety aspect compares with the crits in Crystal Palace Park, do they use barriers or is the park safer because its not as busy?

Saw someone with a home made aero fairing at the Brickendon TT on tuesday was that you polka dot?

New items added 25 May 2013

its one wheel, it is not yet sold, evo533 has dibs and i can post but it would cost you more than the wheel is worth

i can post but it would cost you more than the wheel is worth. where are you based?

Just adding some pics now. Its got a worn rim and needs regreasing/new bearings hence only £5

Updated with new items and prices 17 May 2013.