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Racer Tech Thread

Old 07-08-15, 09:01 PM
  #2026  
tetonrider
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Originally Posted by Matt2.8NJ View Post
Proof of the pudding is in the _________.

Rather than spending a bunch of money on a known weight... maybe it's just easier to measure a known quantity of water as the test mass.
you own 2 power meters and can't afford a calibrated weight?

sure--go the known quantity of water. realize you need >10kg of water (and more like 20kg) to have a better chance of accuracy. oh, and by the way, what's the exact weight of that bucket??
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Old 07-08-15, 09:07 PM
  #2027  
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Originally Posted by tetonrider View Post
you own 2 power meters and can't afford a calibrated weight?

sure--go the known quantity of water. realize you need >10kg of water (and more like 20kg) to have a better chance of accuracy. oh, and by the way, what's the exact weight of that bucket??
Haha, I can afford a weight. How much utility am I going to get out of a known weight around the house after I'm done ? Great advice all around, thanks. BTW I own 3 meters... Third is an old pt built into a disc on my TT bike. But I hate riding the damn thing so I don't worry about it.
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Old 07-08-15, 09:11 PM
  #2028  
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Originally Posted by Matt2.8NJ View Post
Haha, I can afford a weight. How much utility am I going to get out of a known weight around the house after I'm done ? Great advice all around, thanks. BTW I own 3 meters... Third is an old pt built into a disc on my TT bike. But I hate riding the damn thing so I don't worry about it.
i dunno....how much time has been spent in this thread and what's the hourly value of your time? you could have just purchased the weight and been done with it by now!

seriously, though, any meter can go out of spec. i advocate a quick check initially and again after 3 and 6 months of receiving a meter, until you're satisfied that it is bomber. then i check 1x a year, just to prove to myself things are good.

if you have it, you will use it. PTs go out of spec on occasion. you'll catch potential issues earlier and avoid data loss.
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Old 07-09-15, 06:55 AM
  #2029  
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I see Greipel is using a PC8:
https://www.strava.com/activities/341907174/overview

Interestingly it seems that Strava doesn't display the made-up "estimated power" for pros.

... I see for stage 3 he didn't strip the power data out of the uploaded file:
https://www.strava.com/activities/340784637/analysis

Just 1800w NBD.

Last edited by globecanvas; 07-09-15 at 06:59 AM.
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Old 07-09-15, 06:58 AM
  #2030  
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I'm stuck trying to decide whether to go with a Caad 10 frame now or wait a couple weeks/months? for a Caad 12 to replace my broken frame.

Had Cannondale not just announced the Caad 12, I'd have just gone with a 10 and been fine with it. The 12 supposedly rides better, but it does have a slightly different geometry with the BB being 3mm closer to the ground. Theoretically, that would make the 10 a better bike for crits, but Cannondale says that 3mm is intended to offset the height increase from wider tires.

The 12 has nicer paint job options than the 10, which is important, but I would have to buy a complete bike if I go 12 and sell off any parts I don't want.

Do you guys have any thoughts? This will be my back up/race bike. I like the geometry of my past Cannondales better than that of my Argon. (Part of me wishes I had gotten another Cannondale over the Argon, but I liked the paint job and price of the Argon a lot more.)

And all of this decision is being held up by how much money insurance provides me to replace the frame and rebuild my wheels. I won't get that information until late next week.
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Old 07-09-15, 07:21 AM
  #2031  
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Originally Posted by topflightpro View Post
I'm stuck trying to decide whether to go with a Caad 10 frame now or wait a couple weeks/months? for a Caad 12 to replace my broken frame.

Had Cannondale not just announced the Caad 12, I'd have just gone with a 10 and been fine with it. The 12 supposedly rides better, but it does have a slightly different geometry with the BB being 3mm closer to the ground. Theoretically, that would make the 10 a better bike for crits, but Cannondale says that 3mm is intended to offset the height increase from wider tires.

The 12 has nicer paint job options than the 10, which is important, but I would have to buy a complete bike if I go 12 and sell off any parts I don't want.

Do you guys have any thoughts? This will be my back up/race bike. I like the geometry of my past Cannondales better than that of my Argon. (Part of me wishes I had gotten another Cannondale over the Argon, but I liked the paint job and price of the Argon a lot more.)

And all of this decision is being held up by how much money insurance provides me to replace the frame and rebuild my wheels. I won't get that information until late next week.
If it were me, Caad10 or even 9. They are becoming cheap and this is good for a backup. Depends on what you find. I've purchased a Cervelo R3 and SLC framesets for what I've seen Caad frames for.

What insurance do you have on your bike? Or was it the driver's insurance?
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Old 07-09-15, 07:32 AM
  #2032  
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Originally Posted by globecanvas View Post
I see Greipel is using a PC8:
https://www.strava.com/activities/341907174/overview

Interestingly it seems that Strava doesn't display the made-up "estimated power" for pros.
It doesn't display it for me either, unless I'm not using a power meter.

Originally Posted by topflightpro View Post
I'm stuck trying to decide whether to go with a Caad 10 frame now or wait a couple weeks/months? for a Caad 12 to replace my broken frame.
I'd go with the CAAD10 because I hate internally routed cables. Besides, a bike in the garage is worth two in the ether.
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Old 07-09-15, 08:00 AM
  #2033  
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Originally Posted by topflightpro View Post
I'm stuck trying to decide whether to go with a Caad 10 frame now or wait a couple weeks/months? for a Caad 12 to replace my broken frame.

Had Cannondale not just announced the Caad 12, I'd have just gone with a 10 and been fine with it. The 12 supposedly rides better, but it does have a slightly different geometry with the BB being 3mm closer to the ground. Theoretically, that would make the 10 a better bike for crits, but Cannondale says that 3mm is intended to offset the height increase from wider tires.

The 12 has nicer paint job options than the 10, which is important, but I would have to buy a complete bike if I go 12 and sell off any parts I don't want.

Do you guys have any thoughts? This will be my back up/race bike. I like the geometry of my past Cannondales better than that of my Argon. (Part of me wishes I had gotten another Cannondale over the Argon, but I liked the paint job and price of the Argon a lot more.)

And all of this decision is being held up by how much money insurance provides me to replace the frame and rebuild my wheels. I won't get that information until late next week.
Hellafaster - Van Dessel
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Old 07-09-15, 10:00 AM
  #2034  
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Originally Posted by mike868y View Post
That looks nice, but I can get a better deal on a Cannondale than the VD.

Last edited by topflightpro; 07-09-15 at 10:11 AM.
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Old 07-09-15, 11:14 AM
  #2035  
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Originally Posted by tetonrider View Post
i just got home. will send you a note. basically it is up to you to say what you need. a nice thing about SRM 9070s is that one can choose the rings they want off the bat (50/34, 52/36, 53/39, 54/42, 55/42)--especially so for people who want, say, a TT setup; they don't have to buy 53/39 rings they won't use.

as shovel says, below, other than "matching" there is no reason you can't use another crankset, like sram, FSA, etc. there are cheaper models.

DA rings are amazing, though.


hard sayin', not knowin', as they used to say up in alaska.
Id want DA 9000 in 39/53, ideally 180, but anything over 175. (Still can't PM & not in the mood to write a half dozen meaningless posts. )
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Old 07-09-15, 02:23 PM
  #2036  
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Originally Posted by topflightpro View Post
Had Cannondale not just announced the Caad 12, I'd have just gone with a 10 and been fine with it. The 12 supposedly rides better, but it does have a slightly different geometry with the BB being 3mm closer to the ground. Theoretically, that would make the 10 a better bike for crits, but Cannondale says that 3mm is intended to offset the height increase from wider tires.
do you ride wider tires? we're talking about a jump from 23 to 25 for most people (if you're racing 27s you should have a damn good reason...), and most people lower pressure for higher volume, so it seems like a 3mm drop is just going to be lower no matter what. not saying it will make any noticeable difference for you -- i couldn't know that as i haven't been on the bike.

how desperate are you for a new bike? how confident are you in cannon dale's delivery estimates?

i'd probably look for a 10. go with shorter cranks if you are really worried about a few mm in crits. (seriously)

a friend sent this pic....this was an awesome crit course where you could go hard/pedal through every corner. i never had a pedal strike but this photo makes me realize i was getting close. it was a single shot and happened to catch my foot at BCD. wish i had the head-on angle--we were definitely leaning our bikes pretty good through this turn.

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Old 07-09-15, 02:30 PM
  #2037  
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Originally Posted by Hls2k6 View Post
Id want DA 9000 in 39/53, ideally 180, but anything over 175. (Still can't PM & not in the mood to write a half dozen meaningless posts. )
PM sent.

with shiimano units you select your crank length (165-180) and rings.
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Old 07-09-15, 03:49 PM
  #2038  
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Originally Posted by topflightpro View Post
That looks nice, but I can get a better deal on a Cannondale than the VD.
"the VD". haven't heard it called THAT in a while.
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Old 07-09-15, 04:31 PM
  #2039  
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hey, who told you you could take over for @rkwaki?
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Old 07-09-15, 05:04 PM
  #2040  
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Originally Posted by tetonrider View Post
hard sayin', not knowin', as they used to say up in alaska.
You get me a DA9000 53/39 172.5 SRM for a grand, you got a deal. If you can't, then I rest my case.
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Old 07-09-15, 05:06 PM
  #2041  
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Originally Posted by shovelhd View Post
You get me a DA9000 53/39 172.5 SRM for a grand, you got a deal. If you can't, then I rest my case.
+1
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Old 07-09-15, 05:11 PM
  #2042  
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Originally Posted by shovelhd View Post
You get me a DA9000 53/39 172.5 SRM for a grand, you got a deal. If you can't, then I rest my case.
But can you easily upload SRM data to Strava?
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Old 07-09-15, 05:16 PM
  #2043  
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Originally Posted by Doge View Post
But can you easily upload SRM data to Strava?
Well, I can. Maybe lower power levels use less bandwidth.
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Old 07-09-15, 05:54 PM
  #2044  
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Originally Posted by revchuck View Post
Well, I can. Maybe lower power levels use less bandwidth.
Somehow, this has often been an excuse for others not uploading. Hmmm. Maybe you're correct.
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Old 07-09-15, 06:09 PM
  #2045  
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Originally Posted by shovelhd View Post
You get me a DA9000 53/39 172.5 SRM for a grand, you got a deal. If you can't, then I rest my case.
you already own an SRM or 2. you use the stages for commuting, no?

you want the latest and greatest for a fraction of cost? if i could pull that string for you i would. anyone else want in on that deal? let me go to my money-printer.

most of us in this forum spend lots of coin (relatively) on bikes, kit, shoes, etc. we also spend tons of hours on our bikes. the cost per hour of some of this stuff turns out to be low.

on a serious note, when that SRM is still in service 10 years from now but the stages is sitting in a landfill, value becomes more apparent. not hating on stages here but they, like Quarq, don't have a great longevity track record in terms of functioning units in the field. you can still find wired SRMs which are bomber. not the latest/greatest, but cheap and STILL working (with stable slope & offsets) a decade later.

@racerEx will tell you!
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Old 07-09-15, 06:12 PM
  #2046  
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Originally Posted by Doge View Post
But can you easily upload SRM data to Strava?
yeah...i just did.
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Old 07-09-15, 06:33 PM
  #2047  
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Some questions need to be asked (not on BF). These kids are weasels.
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Old 07-09-15, 06:33 PM
  #2048  
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Originally Posted by shovelhd View Post
You get me a DA9000 53/39 172.5 SRM for a grand, you got a deal. If you can't, then I rest my case.
+1. Well, okay, I prefer 165mm.
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Old 07-09-15, 06:52 PM
  #2049  
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Originally Posted by Doge View Post
Somehow, this has often been an excuse for others not uploading. Hmmm. Maybe you're correct.
I gotz baby ewang.
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Old 07-09-15, 07:06 PM
  #2050  
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is aluminum fatigue a real thing for alloy frames?
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