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Old 06-07-09, 04:47 PM   #1
J.Lockdown
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PowerTap Mounting on TT bike for Sat. Time Trail

I got my hands on a new Blue T16 TT bike to test out in a couple up coming TT events (first one this Saturday). Want to move my PowerTap (wired) from my Blue RC6AL to the TT bike so I can continue to log my training data and to uses it during the TT event. However before I cut the zip ties and move everything over, wanted to see if anyone had input on placement/images of there owns setup?

Image of Vision TriMaxBars - Not exaclty sure if PT mount will fit on the small stem


I am basically trying to determine the best way to route the wires, and even if it will fit on the stem, before cutting all the zip ties off. (I know I should have went with a wireless version )
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Old 06-07-09, 06:35 PM   #2
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cables are wrapped around the shifter cables. two large zipties keep them in place along the low edge of the downtube.
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Old 06-08-09, 09:48 AM   #3
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[IMG]http://farm3.static.flickr.com

cables are wrapped around the shifter cables. two large zipties keep them in place along the low edge of the downtube.
Ah nice, so it will fit there without to much trouble. Did you mount the receiver on the bottom tube of the seat stay, or on the upper tube as with a road bike?
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Old 06-08-09, 12:33 PM   #4
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With the PT you have a couple of options. I no longer run a PT, but down the rear brake cable and then taped under the top tube, back out the rear cable and the sensor taped/tied to the seat stay. It depends on where you mount the sensor on the seat stay or chainstay as to which is better. Most likely, to get close enough to the hub you are going to be in dirty air from the cranks regardless of where you mount the sensor. For this reason, I like the under top tube method because it is cleaner than taping the front of the downtube. That is one thing I dislike about my SRM, I have to tape it on the leading edge of an aerofoil shaped tube.
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Old 06-08-09, 01:08 PM   #5
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On my blue T16, from the sharkfin to the top:







I found I couldn't get a smooth line underneath the downtube, thus the "u-turn" method at the sharkfin. No zip ties on any of the wires - that tends to be really bad for the wires, and I've gone through too many mounting kits.

And yeah.. i know i need to get the steerer tube chopped...
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Old 06-08-09, 01:57 PM   #6
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Originally Posted by J.Lockdown View Post
Ah nice, so it will fit there without to much trouble. Did you mount the receiver on the bottom tube of the seat stay, or on the upper tube as with a road bike?
it's on the bottom tube

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Old 06-08-09, 05:50 PM   #7
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On my blue T16, from the sharkfin to the top:

I found I couldn't get a smooth line underneath the downtube, thus the "u-turn" method at the sharkfin. No zip ties on any of the wires - that tends to be really bad for the wires, and I've gone through too many mounting kits.

And yeah.. i know i need to get the steerer tube chopped...
Well just mounted it and went on the downtube like you had it. However I was able to get a fairly good line underneath the down tube to get it up. The CPU mount is not sitting exactly level (back is a little higher due to the sort stem) but it works fine. Should work fine for training this week along with during the TT.

Just a side note, maybe its me but the perceived effort seems higher on the TT then my road bike. The wattage can be produced similar but just feels like im working much harder. (I am a noob when it comes to TT so if that sounded stupid, thats the reason)
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Old 06-08-09, 06:15 PM   #8
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Mounting the head on the stem will make it hard to look at without really looking down. Its a bit more visible when the head is mounted on the aerobar extensions.
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Old 06-08-09, 06:25 PM   #9
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You can see the rubber "riser" on the base of the PT mount for mine to tilt it toward the front so I can see when I ride.

And yes - RPE is almost always higher for same wattage on TT. Anywhere from 5-15% for me depending on how much time I've been on the bike. I'm at about 8-10% now.
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Old 06-08-09, 06:29 PM   #10
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Is that a physiological result due to the TT position?

Or is it purely psychological?

I know that "RPE" is a psychological thing, but I also know you lose some power when you're in the aero position, so I guess I'm really asking what part of that 5-15% is due to the physiological loss of power.
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