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Old 08-07-06, 02:53 AM   #1
vinnydelnegro
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31.8 mm seat tube and 32 mm claim on front derailleur

Hi folks. I have a frame that has a 31.8 seat tube (this is the outside diameter) and a campy daytona front derailleur that is 32 mm. I haven't put the derailleur on yet, but I was wondering if this would work. Seems like 0.2 mm wouldn't make much difference, but I don't want to assume. As always, thanks for the advise!
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Old 08-07-06, 03:18 AM   #2
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They are considered the same thing. Good luck

Tim
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Old 08-07-06, 10:28 AM   #3
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They are considered the same thing. Good luck

Tim
Thanks Tim...that is great news!
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Old 08-07-06, 11:00 AM   #4
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Originally Posted by vinnydelnegro
Hi folks. I have a frame that has a 31.8 seat tube (this is the outside diameter) and a campy daytona front derailleur that is 32 mm. I haven't put the derailleur on yet, but I was wondering if this would work. Seems like 0.2 mm wouldn't make much difference, but I don't want to assume. As always, thanks for the advise!
I think they are the same thing... but if there really is a difference and the derailer is slightly too loose, use a very thin shim. A bit of electrical tape around the seat tube should be enough to fill the gap I've done it before and it works great, allows you to get a tight-fitting front derailer without crushing the paint of the seat tube.
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Old 08-07-06, 11:23 AM   #5
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Originally Posted by moxfyre
I think they are the same thing... but if there really is a difference and the derailer is slightly too loose, use a very thin shim. A bit of electrical tape around the seat tube should be enough to fill the gap I've done it before and it works great, allows you to get a tight-fitting front derailer without crushing the paint of the seat tube.
hmm...not a bad idea with the electrical tape. i think i'll give that a try just so i don't chip the paint. it doesn't cause the derailleur to slide?
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Old 08-07-06, 11:27 AM   #6
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hmm...not a bad idea with the electrical tape. i think i'll give that a try just so i don't chip the paint. it doesn't cause the derailleur to slide?
Nope! Because the electrical tape has a bit of give to it, the derailer clamp bites into the tape and holds very securely. I've added electrical tape to most bikes that I've built or repaired, and never had a derailer slide.
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Old 08-07-06, 02:46 PM   #7
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Derailleur sizes are often rounded off in the manufacturer's literature. Seat tubes are 1-1/8" ( 28.57 mm, often given as 28.6 or even just 28mm), 1-1/4" (31.75 mm rounded to 32 mm) and 1-3/8" (34.92 mm or 35 mm).
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Old 08-07-06, 03:03 PM   #8
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If you think about it, 1mm is about the thickness of a dime. So what your dealing with it 2/10ths of the thickness of a dime. Would you worry about this too much? Neither would I.
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Old 08-07-06, 07:19 PM   #9
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If you think about it, 1mm is about the thickness of a dime. So what your dealing with it 2/10ths of the thickness of a dime. Would you worry about this too much? Neither would I.
I'd worry about it when sizing handlebar-to-stem fit and seatpost-to-seat tube fit but not front derailleur clamps.
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