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Clearing-up your Crank Compatibility issues, your questions answered...

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There seems to be a lot of confusion regarding Avio PowerSense and its suitability for your cranks. Let's set the record straight. Avio PowerSense was created to be an affordable, retro-fit power meter. To make a power meter suitable for retrofitting required a lot of testing and many prototypes. Drawing from our experience from making power meters for rowing, we came up with PowerSense, a ‘professional piece of kit’ that can be fitted by you in the comfort of your own shed. 

 

There are many, many bicycle cranks out there, all made in different ways from different materials by different manufacturers. To make a power meter that was suitable for all would be impossible, so we chose the most common variant, the Shimano Hollowtech 2 range. Within this popular selection are the Shimano 105, Ultegra and Dura-Ace models. These cranks all have the same profile and the same shape inner face, perfect for us to fit our power meter on.

 

Why is there a Type A and Type B version?

There are two variants of the standard PowerSense, Type A and Type B. The difference being the orientation on the crank. Type A must be fitted with the battery towards the pedal and Type B with the battery towards the bottom bracket. In an ideal world, they would all have the same orientation, but due to the profile of some of the earlier Hollowtech 2 cranks, such as Shimano 105 56/57/5800 and Ultegra 66/6700, they are not. Fitting a Type A oriented PowerSense would create a small overhang at the battery end, this could cause it to get clipped or knocked off. Whether it's a Type A or Type B, the fitting ability for PowerSense to fit these cranks has not changed. Both are to be fitted with either our official Avio Fitting Kit or at an Avio Approved Service Centre. Anything else could potentially void the warranty.

 

Why choose the Factory Fitting service?

Last year, we tried fitting PowerSense to SRAM carbon cranks with mixed success, so we scrapped that idea. Instead, we improved our Factory Fit service to accommodate the increasing number of new cranks made from multiple materials, including carbon. To the untrained eye, our Factory Fit product looks identical to the shop-bought PowerSense and, to all intents and purposes, it is the same. The only difference lies in where the sensor is fitted. In the standard PowerSense, the sensor is fixed to the inside of the silver base. This base is made of a very thin piece of aluminium. Once fitted with the correct glue, the sensor on the inside will move at the same rate as the crank, thereby giving you an accurate power reading.

For our Factory Fit version, the sensor is now fitted to the crank directly. We strip a small portion of the crank coating away with a powerful laser, then we fix the sensor directly onto the crank itself, not the coating. The power meter is then built up around it, giving it the same appearance as the standard version. Due to the complicated nature of this service, not to mention the expensive equipment involved, this can only be done by ourselves here in Oxford. 

 

I hope that clears things up. 

 

PowerSense compatibility is as follows:

 

Retail Type A:

Retail Type B:

Shimano 105 7000

Shimano 105 5600

Ultegra 6800

Shimano 105 5700

Ultegra 8000

Shimano 105 5800

Dura-Ace 7800

Ultegra 6600

Dura-Ace 9000

Ultegra 6700

Dura-Ace 9100

 

 

 

Factory Fit - All the above cranks, plus:

Shimano Deore XT

Shimano XT

Shimano SLX

Dura-Ace 7900SRAM Red

SRAM Force

Praxis Zayante

Campagnolo 5-Arm

 

If your crank is not listed here, please feel free to get in touch and we can check to see if it is  suitable for our Factory Fit service.

 

Thank you

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