Showing posts with label technology. Show all posts
Showing posts with label technology. Show all posts

Wednesday, 7 October 2015

Could this be the World's lightest Timetrial (TT) bike at 6.9kg ?

Why do we have to make do with heavy TT bikes? We know that standard line is that weight doesn'tt make much of a difference in TT. Sorry this is pretty much mis-information. Except for downhill and really flat courses bike: weight is usually important. v important if its uphill (as is rider weight). Indeed dropping 10kg will save about 1min of a hilly 25mile timetrial which has an 2000m (0.5% ave) of hills see this link. There is added benefit of a light rider because a light rider is also an aero rider!

Therefore, we have been trying to find the lightest TT bike and this could be it (with slight modification)!

Andreas's linden Canyon Speedmax

see http://andreaslinden.se/2013/07/04/canyon-speedmax-cf-2013/



-----------------------specs----------------------------
Frame / fork: Canyon 
Handlebar: Canyon 
Seatpost: Canyon 
Switchboard Group: Shimano Dura Ace 9070, electronic 11s 
Front: Zipp 808 Firecrest, tube 
Rear wheels: Zipp Super 9 disc, tube (or Zipp 808) 
Tyres: A.Dugast Speed ​​Diamond Silk, tubdäck 
Pedals: Look Keo Blade Aero 
Saddle: Selle Italia Optima Teknologika
-----------------------weight----------------------------
Weight: is currently 7.3 kg with Zipp 808, without pedals
-----------------------modification----------------------------
In fact his current Zipp rear disc weighs 1175g which is not bad but the "DASH GRETCHEN" read disc is 770g 
and similarly the Lightweight-autobahn-rear-disc-wheel is only 780g; so if he fitted that it would be 6.9kg! (but ok it would cost at extra 2500 euros!!)


.......and I just found a pic where someone has done just that

http://www.slowtwitch.com/Products/Markus_Fachbach_s_Canyon_3772.html


Saturday, 1 August 2015

Strava app: Initial impression. My first two months of cycling with GPS

Strava is king right now. King of its own GPS tracking mountain. Its an amazing successful running / cycling app which logs your progress and uploads it to the cloud. The really clever bit is that it compares you to everyone else who has ever taken that route (and logged it) and if that doesn't appeal then it compares vs your previous times.

It seems that strava has about 8.2 million sign ups and about 1.2 million monthly active users.[1]

photo(c) bikeradar.com

Background
Strava was created by Harvard rowers Michael Horvath and Mark Gainey.  Strava uses GPS tracking in your smart phone or watch and lets lets you upload them as soon as you finish. The whole process takes only about a minute.  More than 4.5 million segments have been created globally 3/4 cycling and 1/4 running times. Its accurate too, it even deletes portions where you stop for more than 10seconds, there is a lot of processing going on behind the scenes to tie up sometimes flaky GPS signals with what you actually did. Have a look at this link for in depth strava GPS musings of impossibly fast times.

 Now here is where it gets interesting. You can bag a badge for a quick time (maybe they should do super slow badges too ;) ). The best time claims a KOM or QOM (King or Queen of the Mountain), and the site also tracks each top 10s for all time and top 10 for this year. Finally it logs top 3 personal times (for the year and for all time). And it does this for every single segment (roughly 1km+ stretches of your route). It all looks like this:



Achievements
Now you might ask so what? I started using strava in May 2015. I signed up for the free premium trial but there is no need to do this, its still awesome in its free format. I have logged 71 rides and 1 run. I can attest it seriously addictive. I wouldn't dream of going for a ride without strava now, unless its an intentionally slow nip to the shops!

Now I am not a particularly good cyclist, powertap has my 30min PB at only 250w. A pro cyclist is in their recovery zone at 300-350watts and they can cycle 250w with one leg! So not so good then. Neverthless like anyone I can go hell for leather for short periods! Using this and other tactics I have got about 5 KOMs.....ok on unpopular super quiet routes!! But the bottom line is its fun and it keeps your cycling and its a great target for improvement. This is one app which makes you think, technology is amazing these days!

Now for the downside. Some people go crazy. Some have even been killed racing for KoMs. So much so Strava has been sued, and has adapted its app. See this BBC link for an interesting description.

There is a lot more to strava on a personal level. Of course you have your route, speed, distance but you also have watts (estimated and not accurate btw....its about 20% under reporting compared to a watt meter like powertap) and energy used. Speaking of energy used...I went flat out for 30mins and used 467kj of energy (111kcal). Sadly that is about 200mls of orange juice which i drank in 10 seconds of returning to the house! Here is a screenshot of the ride:


Strava knows your entire history (if uploaded) so it can act as a useful training log.

There are also a lot of pro riders on strava link here, with unassailable times and huge rides and some riding on annonymously too.

The bottom line? Strava is free, its accurate, its fun, its motivational. Love it!

[1] https://www.reddit.com/r/Strava/comments/2yxa4j/strava_has_about_192000_premium_users_12_million/