Front mech band clamp sizes

[kaiser]

I thought mech band clamps only came in 28.6,31.8 and 34.9? I have a 30mm one in front of me. Any light to be shed folks?





ps the above figures were of the top of my head and may be wrong :roll:

 

[Bike Hoarder]

Me too! Is it an old roadie mech, or off something special?

 

[kaiser]

Me too! Is it an old roadie mech, or off something special?

Nah its a regular XT FD-M732, took a punt on it on ebay, NOS too.

 

[Bike Hoarder]

Got me stumped then, anyone else? :?

 

[one-eyed_jim]

The standard frame tube sizes are all inch fractions - 1 1/8" (28.6mm), 1 1/4" (31.8mm), 1 3/8" (34.9mm), etc.

I know that old French road bikes often used metric tube diameters that were close equivalents to the Imperial sizes - 25mm, 28mm, etc. Just a guess, but I wonder if there were early French mountain bikes that had a 30mm seat tube. I know that Shimano were still supplying French standard parts for the French market fairly late in the day: I've got a French-threaded UN71 cartridge bottom bracket in a box somewhere.

 

[kaiser]

Should add that the 30.0 size is stamped on the inside of the band.

 

[Carsten]

i once had a 30.0 M732 too but havent seen it on any other model yet. it worked on a 31.8mm seat tube with a longer bolt cause the clamp is flexible enough. no idea what they were meant for.

carsten

 

[one-eyed_jim]

Here's what's described as a 28.0mm XT 730:

http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... 0298905124

Really 28.0 or just a typo for 28.6?