Note that the 'tyre' is hard plastic and not rubber. As such it has no 'grip' and I suspect that on a cold winters day any impact would shatter the plastic. The locking mechanism is a mystery. Press the brake from 'off' to 'on' and it engages but continue to press to 'on' and it disengages. Overall very disappointed with this item considering its premium price. Most positive thing - it's bright orange.