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It's rider specific.

Look at the downhill sections of the Tour for example, where the riders are doing 30m/s or more. Or gravity bike racing, where the offroad riders regularly hit 30m/s (60mph) and the record is 130mph, and interestingly the on-road riders are slower, probably because of a lack of suitably steep paved roads. As a comparison point, the UCI record for an upright bicycle is about 20 m/s (45mph).

Personally I don't go much above 15m/s on my uprights and never above 20m/s (about 45mph). But with more wheels and a safer riding position I've felt fairly safe doing a 10 minute descent between 20 and 30m/s. I don't know what my maximum speed was there as my speedo loses the peak speed at ~10m/s and gives a maximum of 146km/hr (presumably related to wheel size and minimum possible time interval on the sensor).

It's rider specific.

Look at the downhill sections of the Tour for example, where the riders are doing 30m/s or more. Or gravity bike racing, where the offroad riders regularly hit 30m/s (60mph) and the record is 130mph, and interestingly the on-road riders are slower, probably because of a lack of suitably steep paved roads.

Personally I don't go much above 15m/s on my uprights and never above 20m/s (about 45mph). But with more wheels and a safer riding position I've felt fairly safe doing a 10 minute descent between 20 and 30m/s. I don't know what my maximum speed was there as my speedo loses the peak speed at ~10m/s and gives a maximum of 146km/hr (presumably related to wheel size and minimum possible time interval on the sensor).

It's rider specific.

Look at the downhill sections of the Tour for example, where the riders are doing 30m/s or more. Or gravity bike racing, where the offroad riders regularly hit 30m/s (60mph) and the record is 130mph, and interestingly the on-road riders are slower, probably because of a lack of suitably steep paved roads. As a comparison point, the UCI record for an upright bicycle is about 20 m/s (45mph).

Personally I don't go much above 15m/s on my uprights and never above 20m/s. But with more wheels and a safer riding position I've felt fairly safe doing a 10 minute descent between 20 and 30m/s. I don't know what my maximum speed was there as my speedo loses the peak speed at ~10m/s and gives a maximum of 146km/hr (presumably related to wheel size and minimum possible time interval on the sensor).

1
source | link

It's rider specific.

Look at the downhill sections of the Tour for example, where the riders are doing 30m/s or more. Or gravity bike racing, where the offroad riders regularly hit 30m/s (60mph) and the record is 130mph, and interestingly the on-road riders are slower, probably because of a lack of suitably steep paved roads.

Personally I don't go much above 15m/s on my uprights and never above 20m/s (about 45mph). But with more wheels and a safer riding position I've felt fairly safe doing a 10 minute descent between 20 and 30m/s. I don't know what my maximum speed was there as my speedo loses the peak speed at ~10m/s and gives a maximum of 146km/hr (presumably related to wheel size and minimum possible time interval on the sensor).