Front derailleur tube diameter

[Vargas]

Which is the front derailleur tube diameter in the conversion kit?
I want to buy a n-gear jump stop and they are sold in three diameter sizes: 1 1/8, 1 1/4 and 1 3/8.

 

[1happyreader]

conversions

From reading the forum posts your tube diameter should be 34.9 mm or 1 3/8.
please double check it on your bike.

34.9mm = 1.374 in

1 1/8 = 28.575
1 1/4 = 31.75
1 3/8 = 34.925

click here for chart link.

 

[Vargas]

I am away from home

Thanks. I am traveling away from home and can not check it. But I think it is 1 3/8 too. Lets see if someone confirms it.

 

[Doug Burton]

IT's 34.9mm...

Fairly common size if you purchase a new derailleur, not too common on donor bikes.