Setting the correct tire size

The Archives Archived: Tips and Troubleshooting
1

I got bored of my numerous indoor training sessions (recovering from an accident) with just music to listen to, so when I found Zwift a whole world opened up, thanks!

As it states a simple speed sensor and ANT+ dongle is sufficient to ride. My problem is is that I have a spinningbike set up at home and since Swift assumes my wheelsize is 700C, which it isn’t cause I got a small flywheel, the speed is messed up big time (like 210%).  Somehow that also seems to mess up my cadence which I don’t understand.

Is there anyway to let me change the wheelsize (or any other setting to get the speed in order)?

2

Is it the magnet based?

 

Or garmins hub style.

 

If magnet based then you will need to borrow a garmin head unit or similar, to calibrate and flash the firmware in the unit.

 

What you should do is just this pack.

http://www.competitivecyclist.com/garmin-bike-speed-sensor-and-cadence-sensor?ti=U2VhcmNoIFJlc3VsdHM6Z2FybWluOjE6MjA6Z2FybWlu&skidn=GRM003E-BK-ONESIZ

3

I got a GSC-10 installed on the spinningbike connecting to a Suunto Movestick. Your saying I can tweek the internal firmware of the sensor?

My regular bike is rigged with Polar sensors and headunit. Basicly I only got the GSC-10 to connect to Zwift :slight_smile:

4

Yeah.  just see if you can borrow a garmin

5

No luck so far. Haven’t been able to get my hands on a headunit.

 

Nobody knows of a simple software program I can run to get the correct settings going?

6

I got my hands on a head unit, calibrated, but it didn’t solve my issue. Seems like Zwift uses a default tire size which doesn’t come close to my trainingbike.

Free Trial is ending, so won’t really be an issue after that, I will be looking into different software until this gets fixed. 

7

+1 on this. Training on an old mountainbike (650B), quite disheartening