One-piece Pedal assist too thick for crank...

[incarNadine]

So I'm thinking to shave the base of the pedal.Easiest fix?

 

[amberwolf]

Not sure what you mean, exactly. Can you post pics of the items in question, and of what you are thinking of doing?

 

[richj8990]

So I'm thinking to shave the base of the pedal.Easiest fix?

You are talking about something like the KT V6 or V12, correct? I know what you mean. The design really sucks. Others have had problems with those. I gave up on them. The supposed 'fix' is to get a wider square-tapered axle so that you have a few more mm on the non-drive side for the PAS sensor. I dunno about shaving off a forged steel pedal. The axle might be a better choice.

 

[incarNadine]

Not sure what you mean, exactly. Can you post pics of the items in question, and of what you are thinking of doing?

You are talking about something like the KT V6 or V12, correct? I know what you mean. The design really sucks. Others have had problems with those. I gave up on them. The supposed 'fix' is to get a wider square-tapered axle so that you have a few more mm on the non-drive side for the PAS sensor. I dunno about shaving off a forged steel pedal. The axle might be a better choice.

Apologies, I mean to file down the face of the crank where it butts up against the pas.

 

[amberwolf]

If you are using the cranks for significant pedal power, modification of them could weaken them in ways that could allow for stress failures later on. If you're only using them to turn the PAS sensor and let the motor do most or all of the work, then it probably won't be an issue if you're not removing much material. The more you remove, the more likely it is that at some point the crank will come off under your foot under torque, and if you are pushing hard you may injure yourself.

You might prefer to use a different sensor that fits in the space you have, or modify the sensor itself to do so if it is possible.

Since you still don't state or show what exactly you have, and the situation created by them, I can't suggest something specific.

 

[incarNadine]

If you are using the cranks for significant pedal power, modification of them could weaken them in ways that could allow for stress failures later on. If you're only using them to turn the PAS sensor and let the motor do most or all of the work, then it probably won't be an issue if you're not removing much material. The more you remove, the more likely it is that at some point the crank will come off under your foot under torque, and if you are pushing hard you may injure yourself.

You might prefer to use a different sensor that fits in the space you have, or modify the sensor itself to do so if it is possible.

Since you still don't state or show what exactly you have, and the situation created by them, I can't suggest something specific.

 

[incarNadine]

 

[incarNadine]

 

[BicycleJoe]

From your photos it looks like there is a better place to start grinding than the crank arm base. Your bottom bracket lock-nut is hanging out, proud of the bottom bracket shell. Grinding that protruding edge of the locker will give less purchase for the splined tool that turns it but you can overcome the shallower splines by snugging the spline socket to the bottom bracket. Use a bolt through the open end of the spline socket tool, bolt the socket to the bottom bracket spindle.

After the locknut is ground flush with the BB shell, grind off what little you have to from the inner face of the crank arm. It won't be much and based on what I'm seeing in you photos, you aren't an X-Games gravity sports athlete. You can afford to loose 2-3mm of the inside face of the crank arm in my opinion.

The low hanging fruit is that locker ring.

 

[BicycleJoe]

...Additionally, there is another place to grind a little off before you grind off the crank arm. The inside face of your sensor unit could be ground down a bit to minimize grinding of the crank arm. You probably know already but that sensor is severely cracked.

 

[biphaeboh]

The Grin video demonstrating the installation of their 24 pole PAS sensor shows them shaving the end of the crank arm base where it joins the BB to make enough space. They don't advise shaving off more than 3mm

 

[richj8990]

Apologies, I mean to file down the face of the crank where it butts up against the pas.

God, these square-tapered cranks. When will they ever go away.

 

[incarNadine]

The Grin video demonstrating the installation of their 24 pole PAS sensor shows them shaving the end of the crank arm base where it joins the BB to make enough space. They don't advise shaving off more than 3mm

Many thanks biphaeboh....I'll go with Grin.

 

[incarNadine]

...Additionally, there is another place to grind a little off before you grind off the crank arm. The inside face of your sensor unit could be ground down a bit to minimize grinding of the crank arm. You probably know already but that sensor is severely cracked.View attachment 335183

Thanks very much for the input.That crack is in fact a seam!

 

[incarNadine]

If you are using the cranks for significant pedal power, modification of them could weaken them in ways that could allow for stress failures later on. If you're only using them to turn the PAS sensor and let the motor do most or all of the work, then it probably won't be an issue if you're not removing much material. The more you remove, the more likely it is that at some point the crank will come off under your foot under torque, and if you are pushing hard you may injure yourself.

You might prefer to use a different sensor that fits in the space you have, or modify the sensor itself to do so if it is possible.

Since you still don't state or show what exactly you have, and the situation created by them, I can't suggest something specific.

Thank you amberwolf.I have now posted some pics.(Think I'll go with the Grin solution. )