Mixing old and new, old TA / Stronglight compact with modern

hamster · Nov 24, 2020

legrandefromage":3347kiq9 said:
Not a clue! Cranks were bendy, frame was small, sold it

And there I was worrying if you had sold the Norman Fay!

Thanks, I'll see what M737 with a short BB feels like.

legrandefromage · Nov 24, 2020

hamster":2ycu2gi0 said:
legrandefromage":2ycu2gi0 said:

Not a clue! Cranks were bendy, frame was small, sold it

Click to expand...

And there I was worrying if you had sold the Norman Fay!

Thanks, I'll see what M737 with a short BB feels like.

Kermitgreenkona has the Norman, it will end up with me again soon, I'm sure.

Tommy27 · Jan 12, 2021

So would a TA/ Stronglight be a lot more flexy than an hollow tech?

hamster · Jan 12, 2021

A lot of this is Shimano marketing puff, as there is no energy loss in the crank from flexing - it simply springs back. The deflections are relatively small anyway, cartianly by comparison with bottom bracket flex.

When the bike industry went to aluminium frames (because they were cheaper to make than steel) then they were noticeably stiffer and harsher to ride. 'Not harsh sir, stiff! Low energy loss!' And thus the myth was born. As Cycle journalism generally doesn't dare moon the Shimano gorilla, this stuff doesn't get challenged. For some reason the magazine that did real-life tests on a jig and worked out that the latest Dura Ace shifted more slowly than the old one didn't get many more reviews to do. Etc.
If you read the Bicycling Science book, US Army research suggests that harsh frames would be actually less efficient as they bounce the muscles around which DOES give an energy loss.

pigman · Jan 12, 2021

Tommy27":1irz0k7k said:
So would a TA/ Stronglight be a lot more flexy than an hollow tech?

All you can be sure of is that you won't notice whether it is or isnt, and any difference in speed will be microscopic

It will weigh a few grammes more if that matters

Tommy27 · Jan 18, 2021

I think what attracts me to going back to square taper is that in 7 years, I've had 3 hollowtech bottom brackets and 2 pairs of cranks. I don't remember ever having to change them so much beforehand?

Tommy27 · Jan 27, 2021

Going to put something up in the wanted section, any suggestions for what would be best to run a 46/ 30 on?

Rod_Saetan · Jan 27, 2021

Either a compact MTB triple (94 BCD) without an inner ring (Ritchey for instance, good luck!) or a Stronglight pattern chainset with 86 BCD spider - these are super versatile as you can run any combination of rings from 28 tooth upwards, as close or far away as you think you can get away with, single, double or triple. And the Q factor isn't that bad on the later ones.

I'm planning on fitting a Ritchey triple 110 on my 11 speed road bike once I have rebuilt it, I understand it works well and as there are no tabs for the granny ring the recommended BB length is low - 103 ish - and you can get a 33 tooth small 110 BCD ring too.

Tommy27 · Jan 31, 2021

Re:

Not actually considering these seriously yet, because as much as I love my Roberts frame I'm trying to save for the next one and I'm more intrested in trying this to see how it feels before investing in my 'dream' 650b bike.

However these would be within budget