BB for Topline cranks and Alan Supercarbonio

[Popyafro]

I have a 1995 Alan Supercarbonio with a Shimano BB that I put TopLine cranks on a few months ago.
I want to put a titanium axle on it to lighten the whole thing, but I have a lot of trouble with all the axle standards there are.
I think the Alan will have an ITA axle (36x25), and I THINK the TopLine cranks are JIS, although I'm not sure...
Currently I have only found this axis, but I think it is ISO:

https://www.starbike.com/en/special...quare-bottom-bracket-ita-right-fixed-ti-axle/
Perhaps it's better this "Omnirace" (I don't know its quality...)?

https://www.omniracer.com/product-page/omni-racer-crankset-jis-square-taper-bottom-bracket
Or should I leave my BB and not waste my money?

 

[chickendrumsticks]

Agree with the last sentiment.

 

[jim haseltine]

You might, just might, save 100g at most. Unless there's a BB unit that you know will do the job, in all honestly it's not worth the hassle.

 

[chickendrumsticks]

Spot on as usual Jim.
My usual advice: eat less, pedal more (doesn't apply to me, obviously).

 

[Popyafro]

I've removed my cranks, and I've found this....
It's a 113mm 36x224 BB, Shimano one...but I can't see the model... (I haven't removed the BB)
Perhaps it's a good idea to keep me calm...

 

[Popyafro]

Does anyone know what shimano BB model that might be?
I can't find it....and I want to know its real weight...

 

[TreaderSteve]

Just remove it and find out for sure, then weigh it? Topline were American weren't they, so would most likely be JIS? 36x24T (70mm width) is Italian thread. A JIS taper Italian titanium BB is probably out there. Or as above, eat less Jaffa Cakes or have a good dump.

 

[zerogravitas]

A UN55? Or maybe a UN300 if it's newer. About 300g. As already posted, if it's smooth, I'd leave it in and ride.

 

[bikeworkshop]

36x24T (70mm width) is Italian thread.

And topline is JIS, like shimano, so you already have the right bb.

I had topline cranks on a hope titanium bb axle, it creaked so loudly however much you torqued it exactly, greased or didn't grease - in the end i fitted shimano, end of creaking!

The earplugs weighed more than the difference between steel and ti axles.

(ti isn't ideal for a bb axle, and the topline cranks aren't very stiff - go too light, go home with a broken bike!)

 

[ChromeChainstay]

Spot on as usual Jim.
My usual advice: eat less, pedal more (doesn't apply to me, obviously).

i vary it a little

"eat less and spend the money on bike parts and cycling clothing'