Hollowtech II safety check

A quick and simple check to confirm your Hollowtech II bottom bracket and axle are fine.

Note:
Shimano Hollowtech II crank-arms do have a silly design - but the axle and bearing design is a pretty light, stiff and safe one (except on the high-end superlight cranks where everything is so thin there is no margin for any defects or problems down the road). Square taper bottom brackets last a lot longer, but can break due to material fatigue without enabling a practical way for regular checks (the cracks start between the axle and the crank arm - so the crank arms must be removed to check, which is highly impractical).

CONTENTS:
00:00 Introduction
01:13 Quick demonstration
01:46 The risk explained
03:46 The check explained
04:59 Bearing preload explained
06:24 Detailed demonstration
08:44 Conclusion

Useful LINKS:

The limits of bicycle helmets:
https://www.youtube.com/watch?v=Xk2GBRbNJ0c

Unsafe and bad cycling industry patents:
https://bike.bikegremlin.com/10123/unsafe-cycling-patents/

Bicycle bearing types explained:
https://bike.bikegremlin.com/2002/types-and-construction-of-bicycle-bearings/

Cycling industry nonsense:
https://bike.bikegremlin.com/17645/cycling-industry-nonsense/

The shirt :)
https://shop.bikegremlin.com/product/tshirts/drawings/for-the-tanith-for-the-emperor/

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