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Powertap vs SRM

SRM, the Internet also means ever gold standard of the power meter, or the mainly English-speaking common PowerTap - Which is better?


SRM - Benefits

• Works with all wheels
• is fast, thanks to modern fastening methods used on different wheels
• Applies can be used as foolproof, also in all-weather capability relates
• Durable
• slope easily measured by yourself and set new be (but must be done regularly - see cons)
• Works on a variety of road bikes (regardless of whether cross, road or rail)

SRM - Disadvantages

• expensive, depending on the source, about 3000 €
• battery exchange can be formally performed by SRM itself, is typically every two years - this applies to both the crank and for PC5 battery
• crank length may change, but relatively expensive
• slope must be adjusted periodically

Powertap - Benefits

• works relatively problemarm in a variety of bikes, not but Fixed barrel or rail wheels
• Can be very slightly more wheels be used - Just plug in the rear wheel and the display on the handlebars attach
• slope can be reviewed (not myself but adjusted) are
• Relatively cheap (good € 1000)

Powertap - Disadvantages

• Hub is a weak point (as with most wheels)
• slope can only be adjusted in saris itself
• If the rear something breaks that is not itself (easily) be repaired, the system can be used again until It is back from the repair

correctness the displayed values

The experience of my two Power Meter - PowerTap SL (wired) and SRM (wired) with PC5 - are mixed. My PowerTap had to fly to a good six months for repairs to the USA. There, apparently the power unit was replaced. Since then - after all, now four years later - seems to indicate the device is still the right one. A measurement with a 20-pound weight has shown that the crank while a torque of 135 instead of 136 lbs in display. With the error of less than a percent I can live with, especially since it is not impossible that the weight of 200 grams more or less weight and thus differ by one percent.

The SRM was developed from a more or less unused winter also recalibrated. With the same weight has been found that the slope has increased from 31.7 Hz / Nm to 32.6 Hz / Nm. Subsequently, the power meter removed and the screws that connect the power meter to the crank, reviewed and tightened by four, as well as a slightly loose crank bolt. The subsequent review of the slope has now shown that it was 33 Hz / Nm. The system is therefore relatively sensitive in this regard. Also seems to be a left-right imbalance to be present. The values differ by 4%, ie + / - 2%, which is in itself in the specification.

Who then is the "winner"? In my view, can not answer this question. Both systems have their relative advantages and disadvantages, and even the price difference is because I "need" itself at least two or three rear wheels with performance measurement would.

So you can confidently choose from the gut!