WATTAGE

Click Here for Our Wattage Chart in a Printable Format (will open in a separate window)

Wattage is a measure of the amount of energy or power you are using when you are riding your rollers. Higher resistance requires more power to go a given speed. Conversely, you have to ride a slower speed to maintain the same wattage output when the resistance increases.

Notice on the chart, to cruise at 20mph, the following power is required:

4.5 rollers require approximately 126 watts*
3.0 rollers require approximately 176 watts*
2.25 rollers require approximately 239 watts*

Another way of looking at the chart is to see what speed you would have to be riding on each of the three rollers to maintain the same power output:

At a 200-watt* power output:

4.5 rollers can be ridden at approximately 30mph
3.0 rollers can be ridden at approximately 22mph
2.25 rollers can be ridden at approximately 18mph

Notice how much resistance you can add with the Headwind Fan! With this chart, you can see why we always recommend the Headwind Fan be combined with 4.5 drums. The combination gives you the widest range of resistance, from low to extremely high. You can develop your spin and also get a hard workout when you want one.

Modern training aids such as the SRM Power Meter Cranks (http://www.srm.de/) measure your wattage output on a bicycle, and were used to collect the data on the Wattage Chart.

*The Wattage Chart was created to show you the relative differences in resistance between the various roller models and the accessories. The actual amount of energy required depends on several factors including body weight, tire pressure, wheel aerodynamics, and other factors. But for any one rider, the relative differences you see in the chart still apply.

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Kreitler Wattage Measurements using SRM Power Meter Cranks
	4.5	3.0	2.25		FORK		KILLER KOOL HEADWIND FAN
	DRUMS	DRUMS	DRUMS		STAND	FLYWHEEL	1/4 open	1/2 open	3/4 open	full open
MPH					-	+	+	+	+	+
10	46	65	72		-9	10	31	34	46	44
12	61	86	103		-14	17	41	51	68	68
14	76	106	134		-19	24	54	73	97	100
16	91	127	166		-25	31	70	100	132	140
18	106	148	197		-30	38	88	133	172	188
20	126	176	239		-37	47	103	165	214	238
22	142	197	271		-42	54	126	207	266	301
24	157	219	303		-47	62	151	254	325	372
26	172	240	336		-53	69	178	306	389	451
28	188	261	368		-58	76	208	363	459	538
30	203	283	400		-63	83	239	425	536	633
32	219	304	433		-69	91	273	492	618	737
34	234	326	465		-74	98	309	564	705	848
36	250	347	497		-79	105	346	640	799	968
38	265	369	529		-85	113	386	722	898	1095
40	280	390	562		-90	120	427	808	1003	1231
42	296	411	594		-95	127	470	898	1114	1375
44	311	433	626		-101	134	515	994	1230	1527
FIGURES ARE FOR COMPARISON PURPOSES AND ARE BASED ON A 160 POUND RIDER USING 700X25C TIRES AT 110 PSI.
ACTUAL WATTAGE WILL DEPEND ON BODY WEIGHT, TIRE PRESSURE, WHEEL AERODYNAMICS, AND OTHER FACTORS.
HIGHER BODY WEIGHT OR LOWER TIRE PRESSURE WILL INCREASE RESISTANCE.
*figures are close approximations and no guarantee of absolute accuracy is explicit or implied