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Indoor training speed (distance) inaccurate- was fine

I’ve read several posts but none have helped me.

im using Kickr trainer and have Garmin 1040 as well as Garmin cadence sensor. I’m doing structured workouts via the Garmin 1040.

Tthe speed (and thus distance) had been calculated fine until recently. Now I’m getting 45-50 mph when I’m doing 15-20 mph (I know this as I looked at speed from my wahoo app). No, I can’t do the workouts with the wahoo free app. I’ve done a spin down with wahoo and it’s calibrated. When I attempt to calibrate sensors with the 1040, it tells me the goal speed is 59 mph which, given it’s being calculated incorrectly, also happens.

ive fiddled with entering a wheel circumference in the kickr sensor as well as the cadence sensor. The kickr is setup to be 2070 mm per wahoo site. I e used that as well as others just too see if it changes. Doesn’t help.

any clue?

0 Luko79 8 months ago

is it a Core with the latest firmware? or kickr v6? i assume the gear ratio is the culprit ( i think it came with the virtual gearing. check the wahoo app for settings because the 2.73 is 36T-13 gearing (or similar), if you do the erg session different gearing, i mean on big ring and middle rear, than that fool it for sure.

0 Luko79 8 months ago

and one more, in the wahoo app, the ERG Mode Speed Simulation is OFF or ON?

0 Greybeard 8 months ago in reply to Luko79

It’s off.

This is a kickr v2 or 3.

0 L.Rouge 8 months ago in reply to Luko79

Somehow I have missed the garmin explanation regarding "Gear Ratio" on both my speed sensor and trainer, where is it and what does it do , I have never changed it from the default 2.73, should I and if so to what, I have a triple front 48-36-24 and 12-36 back. On the trainer seem to spend most time using front 48 and mid to higher on the back

0 Greybeard 8 months ago

I found this with an answer about gear ratios. Is it really this simple?
forums.garmin.com/.../what-is-my-gear-ratio

0 L.Rouge 8 months ago in reply to Greybeard

Thanks, Maybe the “gear ratio” was used a long long time ago when trainers were not as “smart”. Smart Trainers have in built speed sensors (really rpm counters, coupled with wheel size) to “measure” (estimate) speed and cadence. I often use my seperate speed and cadence sensors rather than the trainers in- built ones and the speed is the same or very close regardless of which one (the cadence sometimes can vary more for short periods?). Perhaps ERG mode needs the ratio more? If I use the trainers app (Tacx Training App) then it does not ask for or store any gear ratio?

0 Greybeard 8 months ago in reply to Greybeard

This didn’t help.

ive now done a spin down and the trainer is almost impossible to pedal after about 5 seconds. I noticed during spin down that it jumps a high speed and when it says the spin down is complete it’s still reading 10mph on the wahoo app (and it’s not moving).

See video attached.

very frustrating.

0 MTB 8 months ago

I have a kicker snap and after Wahoo updated their app, I started to have issues with simple controlling of my snap trainer. I my opinion wahoo took the user-friendly app control and turned it into a user not friendly app, so I don`t use it. I have always had issues similar to you with the wahoo ERG mode. What works for me with the 1040 and the snap is to load a ride that I have saved in the 1040 and run it for a training session. It comes very close with the resistance profile of what I experienced on the road and trail. I can follow on the map where I am at on the ride which is cool and elevation profile works as well. Using the saved ride gives me the same features that I use out on road and trail. I use a wahoo speed sensor on rear wheel and a powerlabs cadence on crank arm. Will replace cadence sensor with a Garmin or wahoo soon. Not familiar with the kickr, but maybe my experience with the kickr snap might give you another path to try and see if this works for you. I will not go back to the wahoo app on phone again since I found the ability to use past rides on the 1040 to control trainer. Works well.1040 works great for a trainer control.