Crank arms with 15mm diamond taper and 170mm length

[rmac1]

Hello everybody,

Apologies if this isnt the correct forum to post this.

Looking for the right hand side crank arm (or both) for a indoor exercise spin bike.
Arm specs:

• 170mm length
• 15mm diamond taper

Heres an almost contender however the diamond taper is only 13.1mm: Amazon product ASIN B07VCW5QJTView: https://www.amazon.co.uk/Bnineteenteam-Crank-Diamond-Square-Horizontal/dp/B07VCW5QJT/ref=pd_rhf_dp_p_img_5?_encoding=UTF8&psc=1


Any advise or where to look would be great, been looking for days without success.

Thanks in advanced

 

[Sharky]

Check the dimensions.
The 15mm might be referring to the long diameter (corner to corner) and the 13mm, referring to the short diameter (side to side)?

 

[rogerzilla]

JIS is 12.7mm at the short end. ISO is a bit smaller. You're unlikely to find anything else, although tolerances are notoriously sloppy for square taper.

 

[rmac1]

Hey guys,

Thanks for your input. Its defo wall to wall.
I bought this from Halfords and it didnt fit:

We can see wall to wall goes around 12 to 13mm, which by the majority of my searches its the standard.

It seems Argos with their Roger Black model didnt do it standard, when I measure the crank square its 15mm.

I am however hopeful after seeing this comment on one of the items in amazon:

So it seems Wattbike might be similar.