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25 views and not a single reply.... I'm sure i can't be the only one wondering how many "holes" he's got.
Having said that. All speed trap is, is a candance/speed sensor integrated on your bike. It can be paired with any ant+ computer.
So i dunno what you mean by advantages over standard computers. I guess an advantage over having a garmin sensor is that it would not have to be secured with zip ties or something and therefore be slightly more aerodynamic.
Like everybody else said, I have on on my Speed Concept and love it that it tucks in nicely and looks like nothing is there, I also love it because it doesn't interfere with my wheels like my garmin one does if I change wheels and forget to reposition the arm away from the spokes.
The DuoTrap is a ANT+ speed and cadence sensor intended to mount through the left chain stay of Trek Madones and Speed Concepts. Unlike the SpeedTrap, it has neat LEDS that flash when the wheel or crank arm magnets pass the pick up when first activated.
Most of the comments in this thread refer to the DuoTrap.
Regardless of whether you're asking about the SpeedTrap or DuoTrap and assuming you have a Speed/DuoTrap-compatible frame, I'd suggest that they offer better integration into your bike than a "general purpose" sensor. However, all ANT+ sensors are (supposed to be) compatible and it won't make any difference to your ANT+ computer head which sensor you use. If you have a DuoTrap compatible frame and if you're not getting cadence from a power meter, you get speed and cadence from a single device rather than having to use individual sensors for speed and cadence.
I don't know which computer you're using but I can confirm that the SpeedTrap and DuoTrap both work with SRM and Garmin head units.
1. I have a Polar HRM....is that compatible with any of the Trek computers?
2. I don't have a power meter, don't plan on getting one anytime soon. HR and cadence would be ideal....suggestions for a head unit?
1) I don't believe polar is ANT + compatible- look this up I can be mistaken.
2) It really depends on your budged and how serious you'll be about cycling. What do you expect from this unit?
Prices range from >600++ to about 40 dollars. It's really up to you.
I own a garmin 500 and am incredibly pleased with it ($300ish) but then again, you can go to your local REI and get a $40 ant+ wireless computer that will synch to your speed trap sensor, hrm and pair with cadence meters.
I suggest you do some research on this topic, there are plenty of reviews online.
The speed trap is indeed located in the fork on a trek 2.1 and will only be able to give speed feedback, it does not go in the rear chain stay and display both speed and cadence.
The Polar HRM will not work with any ANT+ system, polar does not want to adopt it for their use so no mater if you buy a Trek, Garmin or other it won't work with it.
The speed trap location on your bike will have a "plug" in its place so if you prefer not to have anything and just want to continue riding free of technology then you will be just fine.
If you want to get something that displays both speed and cadence you will have to look for something that won't be integrated and will be installed on the rear chain stay.