There is evidence that a small variety of two-wheeled devices with rear treadle drives ended up built in southwestern Scotland in the early 1840s. Kirkpatrick Macmillan, a blacksmith of Dumfriesshire, is most generally associated with these. He is alleged to have traveled forty miles (64 km) to Glasgow in 1842, https://tedomarket.com/product/sports-entertainment/cycling/bicycle/mountain-bike/mountain-bike-carbon-fibre-mountain-bike-mountain-bicycle/