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Old 04-01-10, 08:58 PM   #1
KevinB
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Garmin 705 question

Just a few questions that I can not seem to find the answers for any were else?

Is there a speed sensor that goes on a wheel for the 705 or does it rely on the GPS ?

How does the Garmin transmit data to a computer? Is there another accessory need to transmit data?

Is the cadence available for both the rear or front or just front?

Thanks!
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Old 04-01-10, 09:07 PM   #2
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My Garmin Edge 705 came with a wireless sensor that works on the rear wheel and gives you cadence and speed. The 705 uses GPS first for your speed, but if the GPS loses signal it will use the wheel sensor. It transmits data via a USB cable.
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Old 04-01-10, 09:59 PM   #3
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Is the cadence available for both the rear or front or just front?
Cadence measures how fast you spin your cranks. If anyone knows how to measure that using a front wheel sensor, they're an incredible, freakin' genius because your cranks better not overlap your front wheel if your bike is to be safe to ride.

Garmin combines the sensor for cadence and speed (wheel revolutions) into a single unit meant to be mounted on a seat stay. One magnet goes on a crank, the other on a rear spoke.
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Old 04-02-10, 07:51 AM   #4
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My Garmin Edge 705 came with a wireless sensor that works on the rear wheel and gives you cadence and speed. The 705 uses GPS first for your speed, but if the GPS loses signal it will use the wheel sensor. It transmits data via a USB cable.

Actually, the 705 works in the reverse, at least that's what I've gathered. It takes the speed from the wheel first, but it does record the location from the sat as well. I have noticed this because on one bike I ride I do not have the speed sensor, and it will "bounce" speed quite a bit more, for instance, 11.5, 12.0, 11.5 all in a few seconds, while I'm pedaling with the same effort, where on my other bike that does have the sensor, as I'm pedaling along and watching my speed it will do 11.5, 11.6, 11.5, 11.7, etc.

Now, the edge 305 did indeed use gps rather than the speed sensor, and it was always prone to the odd jumps, particularly in areas where only a few sats were present (ie, thick tree cover, with a mountain on one side). But id would revert to the speed sensor in tunnels and the like.

Joe
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Old 04-02-10, 10:01 AM   #5
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Actually, the 705 works in the reverse, at least that's what I've gathered.
This is correct. The 705 uses the sensor if it is in use. There is only one sensor that Garmin offers and it is intended to be mounted on the left chain stay (not seat stay). This accessorie is an option. You can buy the 705 with or without it or buy it later. You do NOT need it to get speed. It just makes your speed more accurate and adds cadence.

You also asked about gettting info to your computer. The 705 comes with a standard USB cable for transferring data. Nothing additional to buy.
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Old 04-02-10, 12:34 PM   #6
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This is correct. The 705 uses the sensor if it is in use. There is only one sensor that Garmin offers and it is intended to be mounted on the left chain stay (not seat stay). This accessorie is an option. You can buy the 705 with or without it or buy it later. You do NOT need it to get speed. It just makes your speed more accurate and adds cadence.
I'm not sure how the algorithms or preference work, (if you have both satellite coverage and the wheel magnet) but in the settings menu, if you don't know your wheel circumference, you can set it to "auto". I assume this calculates your wheel circumference by comparing the rpm against GPS speed and uses it during poor satellite coverage.

Are you sure it will always use the wheel sensor first?
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