BrainInAJar

So I'm picking up a set of deep-dish carbon tubulars that I want to use as race wheels, and keep my CXP33's on for training (because they're bulletproof.) I ride 9 speed so I'll probably swap my DA cassette out for Tiagra, and put it on the new wheels

Couple questions though... Will I need to adjust the derailleur every time I swap out? And what about my Garmin, how will it adjust to the different wheels ( does it auto-adjust or do I need to tell it "hey I've got new wheels, forget what you know about them)

And an unrelated note, is there a way to manually input wheel size on the 500? I want to put a speed/cadence sensor on my track bike, but the velodrome is indoors so I'm not sure riding around in a 200m circle inside is going to give GPS results decent enough to set the correct distance. Will I need to ride a brakeless fixie on the streets for a couple miles to set it up like a damned hipster? Do I also need to wear skinny jeans, a lumberjack shirt & put some PBR in the bottle holder for this?

svtmike

You might have to tweak the rear derailleur when you swap it out.

If you're using GPS for the speed on the Garmin, you don't need to do anything.

If you are using the speed/cadence sensor, you could leave the magnet off of the "outdoor" rear wheel, and it'll pick up speed from the GPS when you're using it, and pick up speed from the S/C sensor when using the velodrome wheel.

You can also set up two different bikes in the Garmin, and switch between them depending on which wheelset you've got on if you want to put a speed magnet on both rear wheels.

It is definitely possible to manually input wheel sizes. Just measure the roll-out and then enter the measurement in the menu.

BrainInAJar

Hmm... so it won't auto-correct on the fly & there's no way of telling it to forget the wheelsize?

rdubbz

you'll need to change brake pads too if the new wheels have carbon brake surface.

svtmike

It'll ignore wheel size settings if it's taking speed/distance off of the GPS, so that's auto-correcting.

Using the speed sensor, you can have it autosense using the GPS, but I've heard it's not very accurate. I never used it on mine -- I just set the custom tire settings and switch bike settings when I use different bikes.

Homebrew01

Make note of how much rear derailleur adjustment is required. Then when swapping wheels, you can remember that "Wheel_A" = 1 turn counterclockwise, so "Wheel_B" = 1 turn clockwise.
Now that I have too many wheels, I can't keep track any more.

Blackdays

It's not a pizza - don't call it "deep dish."

adriano 

urbanknight

Maybe 1 or 2 twists of the barrel adjuster if anything, and you'll get used to it.