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-   -   Interesting finds around the web (https://www.bikeforums.net/showthread.php?t=929230)

wens 02-09-16 07:47 AM

Hmm, I need to draw the system to really think this through, but assuming negligible damping, I don't think deflection of any component changes measured power enough to matter, since everything is deflecting at the same time. The reason you get lower readings for a power tap vs crank based pm is fiction losses in the chain. Probably tiny for a track bike. Power taps do have some aliasing effects because they measure time based instead of event based. Not sure how much it matters for sprinters, but it's basically negligible for enduros.

Eta: by same time I mean the time effects are too small to matter for classical mechanics.

queerpunk 02-09-16 08:14 AM


Originally Posted by taras0000 (Post 18522476)
This just brought about a big face-palm for me. It's so obvious. I don't understand how I didn't figure this out myself. Frankly it's just as accurate as a hub based PM, it just doesn't take into account the minimal losses from the chain.

eh, it's not entirely intuitive because there are parts you don't see. a PM on the spider looks like a PM on the right crank, since it's not really visibly clear that the spider is actually (like, conceptually) located on the spindle, not the right crank - even though it's fairly obvious that it receives input from both cranks.

Banchad 02-09-16 10:33 AM


Originally Posted by carleton (Post 18520260)
Good luck! Can you talk about it? What style? Where are you placing the strain gauges?

I can talk about it but I'd rather not until I actually know whether I'll be able to finish it for my dissertation deadline.

Predator circles its prey with new Major Track one-piece carbon handlebar & stem - Bikerumor

What do you all think of these?

carleton 02-09-16 10:58 AM


Originally Posted by Banchad (Post 18523111)

A waste of engineering and money.

They solve a problem that already has better solutions.


a price around $750 to $800, give or take. You’ll likely have stem length and bar width options since they’re all handmade.
Why would you pay 2.5-3x the price of a comparable top-tier stem/bar setup to have no angle, reach, or bar tilt options? It's a bad idea. They introduced these back in like 2011. They are not popular for a reason.

This is the equivalent of having a fixed, rigid car seat drilled into the floor of the car. No sliding, no tilting, no adjustments of any kind.

Trackliche 02-09-16 11:45 AM


Originally Posted by carleton (Post 18523183)
A waste of engineering and money.

They solve a problem that already has better solutions.



Why would you pay 2.5-3x the price of a comparable top-tier stem/bar setup to have no angle, reach, or bar tilt options? It's a bad idea. They introduced these back in like 2011. They are not popular for a reason.

This is the equivalent of having a fixed, rigid car seat drilled into the floor of the car. No sliding, no tilting, no adjustments of any kind.

+1


Originally Posted by carleton (Post 18523183)
A waste of engineering and money.

They solve a problem that already has better solutions.

This seems to be the whole model of Predator, IMO.

TC

queerpunk 02-09-16 12:27 PM


Originally Posted by Banchad (Post 18523111)
I can talk about it but I'd rather not until I actually know whether I'll be able to finish it for my dissertation deadline.

Predator circles its prey with new Major Track one-piece carbon handlebar & stem - Bikerumor

What do you all think of these?

cool but impractical.

if i was made of money i'd be all about those, for the cool factor. but i'd want to test out the shape of the bar, first, to see if i'd be happy with the sphinx position; i'd also probably wind up having different handlebars to travel with, since those might not fit into my travel bag; i'd also probably wind up maybe not using them on my next bike, since obviously you can't tweak the stem length and angle.

i know a few custom carbon dudes who will wrap a Scatto bar to a carbon stem and smooth out the juncture. that's cool too.

but in general, there's a reason that one-piece bar/stem combos haven't really caught on.

if they were making sprint bars, madison bars, and road bars, they'd probably be a bit more successful.

Dalai 02-09-16 02:56 PM

@Banchad - looking forward to hearing more about it when you are able to talk.

Banchad 02-10-16 03:53 PM


Originally Posted by Dalai (Post 18523889)
@Banchad - looking forward to hearing more about it when you are able to talk.

https://www.youtube.com/watch?v=bgLfOrVJJMg

Trackliche 02-10-16 03:56 PM

More Perko happiness:

https://www.youtube.com/watch?v=g3ri1th4dBg

TC

gtrob 02-10-16 07:11 PM

Those predators will look nice, but Im sure will flex like crazy. They are aiming for 350g, when scattos are 380g for a narrow 37cm bar only. Not to mention all other issues with fit, however once you have all that set its not like it changes much.

But I bet they would look cool

Trackliche 02-13-16 09:29 AM

https://youtu.be/WbYh8i7ZquE

Can someone with the know-how please make me a meme with the part where he says, "Aww f**k; no jeans for you"?

TC

carleton 02-13-16 04:12 PM


Originally Posted by Trackliche (Post 18533453)
https://youtu.be/WbYh8i7ZquE

Can someone with the know-how please make me a meme with the part where he says, "Aww f**k; no jeans for you"?

TC

HAHAHAHAHA!

Well, there's always Zubaz!

http://larrybrownsports.com/wp-conte...az-outfits.jpg

But, on the real, what about Keirin Cut Jeans?

queerpunk 02-13-16 04:35 PM


Originally Posted by carleton (Post 18534218)
HAHAHAHAHA!

Well, there's always Zubaz!

http://larrybrownsports.com/wp-conte...az-outfits.jpg

But, on the real, what about Keirin Cut Jeans?

You know my team is sponsored by Zubaz, right?

https://scontent-ord1-1.xx.fbcdn.net...31&oe=5770B837

carleton 02-13-16 04:55 PM

Yes :D

...which is awesome.

weavie 02-13-16 07:55 PM


Originally Posted by Trackliche (Post 18533453)
https://youtu.be/WbYh8i7ZquE

Can someone with the know-how please make me a meme with the part where he says, "Aww f**k; no jeans for you"?

TC

kinda NSFW, if this offends anyone I'll remove it.
gif: http://imgur.com/980fEp0
vid: *****************otro

JimiMimni 02-13-16 11:57 PM

Keirin Cut Jeans are my favorites. Can highly recommend.

carleton 02-14-16 01:44 AM


Originally Posted by weavie (Post 18534633)
kinda NSFW, if this offends anyone I'll remove it.
gif: http://imgur.com/980fEp0
vid: *****************otro

Not really NSFW. He just used a curse word. Thanks for being cautious, though.

Trackliche 02-14-16 07:10 AM


Originally Posted by weavie (Post 18534633)
kinda NSFW, if this offends anyone I'll remove it.
gif: http://imgur.com/980fEp0
vid: *****************otro

You are my hero.

In my mind, weavie:internet :: RF's thighs:bike

TC

weavie 02-14-16 07:47 PM


Originally Posted by Trackliche (Post 18535401)
You are my hero.

In my mind, weavie:internet :: RF's thighs:bike

TC

If only my goofy internet skills could be traded for an ability to kick at the end of a race.

gtrob 02-14-16 09:26 PM

Perhaps a repost, but US officially sending 9 riders to world champs

https://www.usacycling.org/nine-memb...-announced.htm

plus Bobby is in appeals, hope he gets to finish his career on a high note. I don't recognize the guy riding the Omnium in his place.

carleton 02-14-16 09:32 PM


Originally Posted by gtrob (Post 18537126)
Perhaps a repost, but US officially sending 9 riders to world champs

https://www.usacycling.org/nine-memb...-announced.htm

plus Bobby is in appeals, hope he gets to finish his career on a high note. I don't recognize the guy riding the Omnium in his place.

That's good news. Best of luck to them all.

weavie 02-14-16 09:35 PM

Jake Duehring and Bobby Lea won the Madison at elite nats last year, Jake won the scratch race and finished 2nd to Bobby in the points race.

JimiMimni 02-19-16 07:40 PM

https://vimeo.com/152426375

carleton 02-19-16 09:56 PM


Originally Posted by JimiMimni (Post 18550395)
https://vimeo.com/152426375

For some reason, that's not showing on mobile. Here is the direct link.

https://vimeo.com/152426375

carleton 02-23-16 02:06 AM

USA National Records (road and track): http://www.usacycling.org/usa-cyclin...al-records.htm

gycho77 02-23-16 07:00 AM

Seat post pump
The AirSupply Bike Pump Is Hidden in a Seat Post | Digital Trends

happybday29475 02-23-16 08:59 AM

Women's Team Pursuit data

IBM's marketing department is making hay from IBM's support of USA Track Cycling. Introduction is here, but the really interesting page is the "session analytics" page, which is data from a training run:

http://www-01.ibm.com/software/ebusi...mmary_dash.png

Winder has 25% of her W' left at the end...get to work, lady! :)

queerpunk 02-23-16 09:43 AM


Originally Posted by rapwithtom (Post 18557621)
Women's Team Pursuit data

IBM's marketing department is making hay from IBM's support of USA Track Cycling. Introduction is here, but the really interesting page is the "session analytics" page, which is data from a training run:

http://www-01.ibm.com/software/ebusi...mmary_dash.png

Winder has 25% of her W' left at the end...get to work, lady! :)

THIS IS SO COOL.
the Power Data section is a little bit confusing, but it's interesting to see who's saving a lot more watts when they're not pulling.
i'd love to play with this app.

gtrob 02-23-16 12:38 PM

very cool indeed. That heart rate data doesn't look accurate, valente's is down to hear resting HR during a pull lol.


When you look at how close the top 10 men TP teams are going to be next month, you can start to imagine how valuable this data becomes and its so much more sophisticated then trial and error and guess work.

carleton 02-23-16 01:33 PM


Originally Posted by rapwithtom (Post 18557621)
Women's Team Pursuit data

IBM's marketing department is making hay from IBM's support of USA Track Cycling. Introduction is here, but the really interesting page is the "session analytics" page, which is data from a training run:

http://www-01.ibm.com/software/ebusi...mmary_dash.png

Winder has 25% of her W' left at the end...get to work, lady! :)


This is gibberish:


Team Pursuit Solution

The power data is automatically linked with the lap timing and environment data like humidity, barometric pressure, wind speed or direction. Taking advantage of other leading edge sensors (BSX Insights muscle oxygenation – SmO2) can now be considered during a rider’s training session. New analysis capabilities provide an edge to the training program with visibility into new pacing and transition strategy insights.
This says, "We made a website...and counted laps for the riders":

https://i.imgur.com/fs7PIIv.png

I have no idea what this is:


The solution empowers the athletes with real-time feedback of these critical metrics through the use of Solos™, high-performance smart eyewear, which integrate innovative heads-up display and audio technologies


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