On the Zwift for iOS you can set the wheel size if you are just using a speed sensor, I am assuming that it will be coming to PC and Mac soon.
Here’s a quick rundown of what this update includes:
Workout Adjustments : just tap the screen and use the FTP adjustment arrows to adjust workout intensity up or down by 10%. I’m happy to see this, because I’ve had many days where I just couldn’t hold the wattage I had set up–now I can reduce it a bit but still keep going, instead of skipping entire blocks.
Tire size selector
New tire size selector available if using a speed sensor. Great for kids or 650c wheels. Previously if your wheel was smaller than a standard 700c you were “cheating” since the Zwift assumed all speed sensor users were on 700c wheels. Now you may select your wheel size. This doesn’t apply to smart trainer and power meter users, of course.
Training Stress Score (TSS) is now calculated and shown after a workout. TSS is a popular metric used to track cumulative training stress. Created by the folks at Training Peaks, Zwift has received permission to use the TSS term in game. Learn more about TSS here >
Segment times are now always visible to help track your progress. I’m not sure what this means exactly, since I haven’t seen anything different in game yet.
Event duration and pace information displayed while waiting in an event paddock. A nice remember as you spin and wait for your ride to begin.
Just remember the speed in Zwift is based on your watts, so that is why I don’t think the tire size makes a difference on a smart trainer. It is an issue when using just a speed sensor with a classic trainer and that’s why Zwift is implementing the drop down for tire siz