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-   -   Racer Tech Thread (https://www.bikeforums.net/33-road-bike-racing/956936-racer-tech-thread.html)

shovelhd 07-11-15 03:12 PM

I feel for you guys with the super wide feet. I have narrow feet. Great for cycling shoes, sucks for everything else.

Wylde06 07-11-15 03:24 PM

My feet are pretty wide, luckily not as bad as ygduf. When I need to buy running shoes they usually have to order them because no one carries extra extra wide. Right now I wear sidi megas thats area full size too big...I need a new pair of shoes.

Doge 07-11-15 03:58 PM


Originally Posted by Ygduf (Post 17969535)

Note the business-size envelope for scale. More than a cm wider than the widest commercially available mass-produced shoe. Four hammer toes, including a pinky toe that doesn't touch the ground and instead sits on top there to boot.
...

Have you tried molded orthotics?
Have you tried heat molded shoes (I know that does not make them wider at the sole)?

I am near as wide and have to go off brand, but find that orthodics I had molded 25 years ago make most shoes work.

Matt2.8NJ 07-12-15 03:26 PM

Anyone have experience with a wired SRM PCV simply losing a file?

I raced today, and the unit was functining and displaying power/cadence normally. I go to download, and there is simply no file present.

UmneyDurak 07-12-15 05:09 PM

Anyone loctite their seat bolts? Second weekend in a row they came loose. This time one actually fell out. :| I had never had this happen, and not second time in two weeks. I am thinking putting some blue loctite on that thread.

shovelhd 07-12-15 05:23 PM

Can't hurt. Do you use a torque wrench?

UmneyDurak 07-12-15 06:31 PM


Originally Posted by shovelhd (Post 17973745)
Can't hurt. Do you use a torque wrench?

No, I guess I could. I have a couple I use while motorcycle wrenching. Although what is it 15NM? I am pretty sure I tightened it past that. For better or worse.

revchuck 07-12-15 07:42 PM

Is there a source for wheel disc covers that would let me use my 32 spoke Powertap wheel on my TT bike? That would let me transfer my SRM over to my Look, which I ride more often than my coach requires me to...unlike my TT bike. ;)

ETA: Found one here. Sounds like exactly what I'm looking for. Good/bad choice?

carpediemracing 07-12-15 07:46 PM


Originally Posted by Matt2.8NJ (Post 17973497)
Anyone have experience with a wired SRM PCV simply losing a file?

I raced today, and the unit was functining and displaying power/cadence normally. I go to download, and there is simply no file present.

I had this happen to me a couple times, including a precious race file.

Ends up the download cable was damaged and the wires were shorting or something (black piece that plugs into SRM was cracked and flexing). Fortunately I had another so I'm using that.

I'm sure there are other causes but that was one I ran into myself.

Hermes 07-13-15 12:36 PM


Originally Posted by tetonrider (Post 17970044)
yeah...the promise of "swapping pedals is SO easy" kept so many people on the vector hook during the waiting period. didn't quite work out that way, but maybe newer models will be easier.

there are some scenarios, like a tandem, where pedal-based power is really the only way to go. i also have a friend who is wed to some spin bike at home, and his only option is pedals.

bummer they don't include the torque wrench adaptor with the pedals....it's the least they could do as you HAVE to get that right. (not that using a torque wrench properly is something everyone can do, despite seeming obvious.)

Not defending Garmin per se because, IMO, Vector needed more work before they introduced them but....I own two Vector power pedals and swap them between bikes all the time. It is really easy and fast with a Sears Torque wrench and a crowfoot tool that i ground down to be thinner. The installation takes a few minutes and torquing is easy. The problem is that the pedal pods metallurgy could not take the stress of repeated installations. Garmin sent me several new pedal pods that broke during installation.

Garmin has a new replacement kit that replaces the power meter and new pedal pods that, according to Garmin solve the breakage problem. We will see if that is true.

I use the Garmin Vector on track bikes, tandem and when traveling. And the new firmware for Vector appears to have increased the transient response of the Vector which makes it better for the track. Also, the Vector is not affected by back pedaling and registers zero watts. SRM and Quarq may be affected mechanically except for the SRM that is specifically designed for the track.

With respect to left versus right power measurement, I am not sure what to do with the individual leg data and do not take it into account. It is interesting but I do not attempt to make both legs equal. In general, my left right balance for a track workout is 49/51 L/R.

I did a track workout where we had a pace line behind the motor at 28 mph. When one got to the motor, the goal was to drop to the pole lane and do two laps at race pace and then get back on the motor pace line. During the initial effort, my L/R was 52/48. After the effort, my L/R changed to 48/52. As I fatigue, I become more right leg dominant. Also, riding the 250 meter track with 45 degree banking requires more left leg force in the turns. We always turn left.

Doge 07-13-15 01:15 PM


Originally Posted by Hermes (Post 17975831)
... Also, riding the 250 meter track with 45 degree banking requires more left leg force in the turns. We always turn left.

I wonder about this. I tend to think symmetry is overrated. My daughter (as common) got quite strong in her left leg from planting her left as she would swing and kick with her right - taking goal kicks in soccer.
Son moving to rowing will have to sweep one side or the other - this also creates a dominant side and leg. I'm thinking have him sweep to the weaker side - to improve it.

Bottom right (in link) was the Spin coach which was my project early 80s (working for Ralph). While we found we could both improve circles and balance, I was never convinced it mattered.
Inventor for Inventors

carpediemracing 07-13-15 06:49 PM

[MENTION=99188]tetonrider[/MENTION] I was going to PM you but I figure the answer might be appreciated by others, or maybe others know the answer.

What difference, if any, with a track SRM vs a regular one? In other words what weirdness might I experience if I put my regular wired SRM on a track bike.

(Not that I have a BB30 track bike or that I ride my track bike or that I plan on riding my track bike any time soon but this popped up in my head 6 years ago when I was doing track every week I could. I actually bid on a couple standard SRMs, with Campy square taper, with the idea of putting them in my Italian BB track frame.)

carpediemracing 07-13-15 06:50 PM

dupe post

shovelhd 07-13-15 06:57 PM

Teton, you'll laugh. Last Saturday I forgot to push Start on my Garmin and lost 10 miles of my ride.

echappist 07-13-15 07:27 PM


Originally Posted by carpediemracing (Post 17976909)
@tetonrider I was going to PM you but I figure the answer might be appreciated by others, or maybe others know the answer.

What difference, if any, with a track SRM vs a regular one? In other words what weirdness might I experience if I put my regular wired SRM on a track bike.

(Not that I have a BB30 track bike or that I ride my track bike or that I plan on riding my track bike any time soon but this popped up in my head 6 years ago when I was doing track every week I could. I actually bid on a couple standard SRMs, with Campy square taper, with the idea of putting them in my Italian BB track frame.)

not being able to back pedal does funny things to the zero offset;
also, more reed switches means higher sampling rate. especially important for something short like a standing start or a match sprint

tetonrider 07-13-15 10:38 PM


Originally Posted by carpediemracing (Post 17976909)
@tetonrider I was going to PM you but I figure the answer might be appreciated by others, or maybe others know the answer.

What difference, if any, with a track SRM vs a regular one? In other words what weirdness might I experience if I put my regular wired SRM on a track bike.

(Not that I have a BB30 track bike or that I ride my track bike or that I plan on riding my track bike any time soon but this popped up in my head 6 years ago when I was doing track every week I could. I actually bid on a couple standard SRMs, with Campy square taper, with the idea of putting them in my Italian BB track frame.)

i'm not an expert on track stuff, but maybe this will help you a little bit.

anecdotally i've heard that the rotor units are good for track use (if you need 130BCD), if you can make it work with your track bike's BB.

i've heard the shimano units, which lack a splined interface, don't work so well for the track.

not too sure what the difference between track and road units are, other than BB/BCD.

sorry i can't help further off the top of my head. if it is important i could research but suspect you'd be in just as good a position to do that as i would.

tetonrider 07-13-15 10:40 PM


Originally Posted by revchuck (Post 17974063)
Is there a source for wheel disc covers that would let me use my 32 spoke Powertap wheel on my TT bike? That would let me transfer my SRM over to my Look, which I ride more often than my coach requires me to...unlike my TT bike. ;)

ETA: Found one here. Sounds like exactly what I'm looking for. Good/bad choice?

wheel builder is good option for that. pretty much as aero as a disc...if you can deal with the hassle of swapping it on and off. sounds like for you it is for a dedicated bike, so the one drawback is a non-issue.

not legal in any event where UCI regs apply (like nationals), but that is probably also a non-issue.

tetonrider 07-13-15 10:41 PM


Originally Posted by echappist (Post 17977025)
not being able to back pedal does funny things to the zero offset;
also, more reed switches means higher sampling rate. especially important for something short like a standing start or a match sprint

yes....but if that is important you then want the SRM interface that can handle >1Hz. not sure how picky CDR will be with those sorts of bursts & analysis.

then again, he has CRAZY high cadence capability, from what he's posted over the years.

tetonrider 07-13-15 10:43 PM


Originally Posted by shovelhd (Post 17976942)
Teton, you'll laugh. Last Saturday I forgot to push Start on my Garmin and lost 10 miles of my ride.

oh, man....laugh or cry? at least you realized it 10 miles in.

it's just such a flawed interface.....i get not recording when there is only speed, perhaps (if the bike is on your rack while you drive to your race, for example), but if there is cadence, HR, power?? seems like it is begging for a better solution.

:(

hack 07-13-15 10:56 PM

My 510 gives me a little message if I start moving about without hitting start that basically says "you're moving, wanna start recording?" If I forget to hit start, I am quickly reminded the first time I look down ... no biggee.

carpediemracing 07-13-15 11:19 PM


Originally Posted by tetonrider (Post 17977421)
yes....but if that is important you then want the SRM interface that can handle >1Hz. not sure how picky CDR will be with those sorts of bursts & analysis.

then again, he has CRAZY high cadence capability, from what he's posted over the years.

Only in test situations. In real I'm realistically never going over 150 rpm and rarely exceed 130 rpm. I never had a recording computer on the track so I have no idea what I was doing but I didn't go much faster than 31 or 32 mph in a full on sprint using a 51x15. I wasn't going that fast. Maybe on a better banked track I could go faster but I have no idea, it was pretty hard going 31-32 mph.

tetonrider 07-13-15 11:24 PM


Originally Posted by carpediemracing (Post 17977499)
Only in test situations. In real I'm realistically never going over 150 rpm and rarely exceed 130 rpm. I never had a recording computer on the track so I have no idea what I was doing but I didn't go much faster than 31 or 32 mph in a full on sprint using a 51x15. I wasn't going that fast. Maybe on a better banked track I could go faster but I have no idea, it was pretty hard going 31-32 mph.

= crazy high for those of us who did not learn with junior gear restrictions! :D

gsteinb 07-14-15 04:15 AM

I don't believe cadence itself is the issue, but back pedaling. I'm told a DA unit simply won't hold up due to the nature of the interface. Pro hour guys get away from it because presumably they're not hitting the brakes much, and they don't really have to worry about using the the unit many times.

echappist 07-14-15 08:19 AM


Originally Posted by Wylde06 (Post 17971215)
My feet are pretty wide, luckily not as bad as ygduf. When I need to buy running shoes they usually have to order them because no one carries extra extra wide. Right now I wear sidi megas thats area full size too big...I need a new pair of shoes.

DMT;

my right foot is wider than my left, and the DMT is the only one that fits wells

shovelhd 07-14-15 05:35 PM


Originally Posted by hack (Post 17977447)
My 510 gives me a little message if I start moving about without hitting start that basically says "you're moving, wanna start recording?" If I forget to hit start, I am quickly reminded the first time I look down ... no biggee.

My 800 does too, but only at the start of the ride. I hit stop while waiting for the group ride to start.


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