Kreitler Rollers

Posted on Apr 5, 2023

My cycling trainers are 3" alloy drum Kreitler rollers with the headwind fan and flywheel. All fan belted together it requires a lot of power to spin.

Wattage

Kreitler provides this wattage information on power vs speed & resistance:

MPH	3"	Fly	.25 F	.5 F	1 F
10	65	10	31	34	44
12	86	17	41	51	68
14	106	24	54	73	100
16	127	31	70	100	140
18	148	38	88	133	188
20	176	47	103	165	238

In the table above F == fan. The numbers assume a 160lb rider using 700x25C tires at 110 psi. Assuming a linear relationship, that’s a 20% increase in wattage against the numbers above.

MPH	3"	Fly	.25 F	.5 F	1 F
10	65	10	31	34	44
12	86	17	41	51	68
14	106	24	54	73	100
16	127	31	70	100	140
18	148	38	88	133	188
20	176	47	103	165	238

MPH	3"	Fly	.25 F	.5 F	1 F
10	65	10	31	34	44
12	86	17	41	51	68
14	106	24	54	73	100
16	127	31	70	100	140
18	148	38	88	133	188
20	176	47	103	165	238

MPH	3"	Fly	.25 F	.5 F	1 F
10	65	10	31	34	44
12	86	17	41	51	68
14	106	24	54	73	100
16	127	31	70	100	140
18	148	38	88	133	188
20	176	47	103	165	238