Just trying to make sure I’m clear on what I’ll need…
I plan on getting a Speed Concept 7.0, which comes with SRAM Apex. I also plan on getting a SRAM Quarq 975 GXP power meter, which should drop right in place of the stock Apex crankset (ie. no need to swap bottom bracket bearings). I’ll be using a Garmin 310XT as the head unit. Now to the questions…
From research, it appears that I will not be able to use the supplied ring to hold the Quarq cadence magnet (since the Speed Concept has press-sit bottom bracket bearings). However, some people have had luck with epoxying a rare earth magnet inside the rear brake cover instead of trying to epoxy the Quarq magnet to the chainstay. Have I got that right?
I do a lot of training indoors, and like to have speed/distance for these workouts. If I go with the Duotrap Speed/Cadence Sensor, will this screw up the Quarq readings? Is there any way to set up my Garmin so that it displays the cadence reported by the Quarq, but the speed/distance reported by the Duotrap (so that I don’t have to install a magnet on my crankarm for the Duotrap)? When I’m riding outside, I’ll use the Garmin GPS for speed/distance and the Quarq for power/cadence.
I have the exact same setup and got the Quarq about 2 months ago and use a 310XT. Almost too easy to be true in terms of the install. One bolt on the crank. Start pedaling and the Garmin tells you a power meter is whispering sweet watts into its ear and you click “enter” to connect it.
You’re right that the ring doesn’t work with the press-fit BB and I used the epoxy to stick the magnet. I haven’t seen it since. Works great. Measure twice, stick once.
I live in California, so I only ride the trainer a few rainy evenings/year and I’m excited to get some power data this winter. You’re going to need someone else to finish your questions.
I have both the duotrap and quarq pm combo on my sc 9.9. I have that as I interchange the quarq between my SC and Madone roadbike since its such an easy and quick process. For the times that the quarq is on the sc with the duotrap, I have had no issues with not reading data as you specifically select the sensor unit when you pair the system. Speed/Cadence (Duo) or Power+Cadence (Quarq). Hope this helps.
The question is… Can you get power/cadence from the Quarq and speed/distance from the Duotrap at the same time (ie. not getting cadence from the Duotrap)?
I used the supplied Quarq magnet and epoxy that came in teh box and glued it inside the rear brake cover. once you take the cover off its pretty self explanitory, but i can take a picture if you want to see what I did.
The Quarq will override any cadence data sent from the duo trap. The Garmin will always default to the power meter’s cadence over any other sensor. I do not have a magnet on the crank arm of the Quarq and still get speed while riding indoors.
Not at the same time as far as I am aware, only one sensor pairing to the head unit at the one time. You can preset the pairings through the setting on your Garmin (i.e. Bike1/Bike2) so you can quickly select the paired device setup but its one or the other. Any reason for wanting input from multiple sensors as the Quarq does everything already (Power/Cadence/Speed)? Only way it would work would be to use multiple head units paired to each sensor but this I would think is just a bit unnecessary.
Edit - I realise your concern is sticking the sensor magnet to your frame but I wouldn’t be, I’ve had my magnet epoxyed to the side of the BB for over a year and regularly use the cycleops fluid trainer indoors and no issues even through multiple crankset swaps between bikes or any problems getting all the data readings on my garmin.
Im afraid I can’t help with your exact query but a Garmin 500 or 800 works fine with a duotrap and an SRM At the same time. No cadence magnet for the duotrap, but obviously one (inside the brake cover) for the SRM. Similarly a powertap works alongside a duotrap used just for cadence. No experience with a 310xt in this scenario I’m afraid.
Be very careful with a Speed Concept on a turbo trainer. Some of the skewer sockets can foul the drop out.
Not at the same time as far as I am aware, only one sensor pairing to the head unit at the one time. You can preset the pairings through the setting on your Garmin (i.e. Bike1/Bike2) so you can quickly select the paired device setup but its one or the other. Any reason for wanting input from multiple sensors as the Quarq does everything already (Power/Cadence/Speed)? Only way it would work would be to use multiple head units paired to each sensor but this I would think is just a bit unnecessary.
Edit - I realise your concern is sticking the sensor magnet to your frame but I wouldn’t be, I’ve had my magnet epoxyed to the side of the BB for over a year and regularly use the cycleops fluid trainer indoors and no issues even through multiple crankset swaps between bikes or any problems getting all the data readings on my garmin.
It depends on your definition of “sensor”, but you can certainly pair a Garmin to a power meter and a speed/cadence sensor at the same time, which is all I’m trying to do. I do it currently with my PowerTap and Garmin GSC-10 speed/cadence sensor.
As far as the Quarq doing everything… I don’t believe that it does speed.
I’m not concerned about the Quarq cadence magnet at all. It can go inside the rear brake cover. What I’m tyring to avoid is having to stick the Duotrap cadence magnet on my crankarm, since I’ll already have the Quarq cadence.
My main concern is being able to display cadence, even though I will not be using the Duotrap for cadence. With my current setup, cadence from my GSC-10 is displayed, despite the fact than my PowerTap does cadence. If the Duotrap/Quarq combo works similarly (ie. sensor cadence in priority over power meter cadence), I’d have an issue (unless the Garmin is smart enough to realize that it should use the Quarq cadence if the Duotrap cadence isn’t reporting).
My main concern is being able to display cadence, even though I will not be using the Duotrap for cadence. With my current setup, cadence from my GSC-10 is displayed, despite the fact than my PowerTap does cadence. If the Duotrap/Quarq combo works similarly (ie. sensor cadence in priority over power meter cadence), I’d have an issue (unless the Garmin is smart enough to realize that it should use the Quarq cadence if the Duotrap cadence isn’t reporting).
For Crank based powermeters (SRM, Quarq, and Power2Max) that have actual cadence measurement the Garmin will always use the cadence from the powermeter. Even if you did put the magnet on the crank arm, the Garmin would ignore the cadence data from the Duotrap.
Having just re-tested my setup specifically with quarq/duo and gsc10 setups, the PM will overide the cadence output from the duo and gsc. The PM will work in conjunction with either duo or gsc but obviously as I was alluding to before the garmin head unit throws a wobbly when both the gsc10 and duo are in close proximity during pairing for speed/cadence. Cheers.
Hi…do you mind sending me a photo of how you glued the magnet on a speed concept. My magnet today got lost while on the road and am trying to kind a good way of installing my spare magnet.
Hi…do you mind sending me a photo of how you glued the magnet on a speed concept. My magnet today got lost while on the road and am trying to kind a good way of installing my spare magnet.
Any suggestions would be greatly appreciated.
here are a few photos. I used the putty that quarq supplied, and i used a red market to indicate where the actual magnet placement is.