NaBlade

I've had my unit for about 2 weeks. I have a few questions on the operation of this computer:

1. It seems that I need to re-"pair" the speed transmitter to the main unit everytime I use it. And more often than not, it doesn't re-"pair" flawlessly. There's been a couple of rides where I gave up fiddling with it, and just went for the ride without the speed indicator. (Note: the cadence function works perfectly each time.) Do you have issues like this?
2. What are the "timer up" and "timer down" functions? And, how do you use them?
3. How do you take the main unit off its bracket? I can't seem to take it off and I don't want to force it.
4. For long-time owners, what's your opinion on use of O-rings? I know the cadence magnet and transmitter can be attached with zip ties. But the speed transmitter and main unit have no holes for zip ties to go through, or at least, I haven't seen any. I have this vision of the O-rings deteriorating under sun, wind and rain and then breaking off while I'm riding. *shudder*

pidda

1. Never had the problem; took a few seconds of flashing numbers, then cad and speed was there reliably. Check magnet/sensor alignment?

2. Sounds like a timer that goes up, or down, respectively. Seriously though, check the manual; it's online if you don't have it.

3. Twist it counter-clockwise; the newer ones take a little effort as they are more secure.

4. I've gone to an HRM since, but I used the O-rings for about six months with no ill effects.

mista_chewey

mine always "pair" up everytime i put it on the bracket. doesn't take more than a few seconds of rolling though

time up time down i don't use i just go as fast as i can for as long as i can

slight twist of the head unit and it popped right out

i use ziptie with the cadence magnet and o rings for the sensors they hold it tight enough for me if it doesn't i'll put some tape underneath

NaBlade

I'm a reference manual freak, having an engineering background and working in IT as a software developer. I have read both the hardcopy manual that came with the unit and the online version from Sigma's website (they're exactly the same, except for minor differences). I have checked the Sigma's FAQ, as well.

But they don't answer my question. I guess I didn't get my point across, I wasn't asking "what buttons to press to use this function"; the manual has this covered. Instead, I was asking what real-world applications (regarding bike riding) can the "timer up/down" functions be used for?

Thanks everyone for replying to my other questions.

oboeguy

1) It seems more of an issue for me w/ the cadence sensor, oddly enough. Never a problem w/ the speed sensor.

2) Dunno, don't use 'em.

3) Twist?

4) No trouble w/ O-rings, other than the fact that the sensors can easily be bumped out of position.

kensuf

Intervals?

Wesmo15

1) I've found that electrical tape comes in very handy for solving two of your problems. I had a few problems with the sensor getting bumped, then failing to pair when I began a ride. Attempting to adjust the sensor when riding resulted in the unit getting into the spokes and rocketing off the fork. After searching for the sensor in the weeds while wearing bicycle shorts and carbon fiber shoes (a sight that most WV motorists hassle you for), I decided to secure it with the tape. Not only does this insure the sensor stays in alignment, I don't have to worry about the O-ring failing suddenly. If you're neat with the tape, I doubt anyone else will ever notice.

2) My "timer up" has been running since I installed the unit (which was right after I bought my bike), so it gives me the total time I've ridden my bike, along with total miles ridden. Not really that useful, but I don't use it for anything else.

3) Twist it counter clockwise (if you have the unit mounted on the bar instead of the stem)

4) See #1

NaBlade

Yeah, I've been thinking it has something to do with that. I'll play with this mode sometime tonight and see if it will be useful for intervals. Maybe there's something else I haven't done with it. The manual was a lot lacking in this regard, it just said to press this and press that to get this and that, etc. etc.

Thanks for the electrical tape tip. I did put on electrical tape BEFORE putting any zip ties or O-rings on my bike (similar to my clip-on fenders). I know these sensors may jiggle and move a bit, and the tape just protects from unnecessary ugly scratches down the road. However, I haven't thought of putting the tape over the O-rings, so thanks for that. Maybe it is as simple as an alignment issue.