Chain wrap is the key on use of your Campy Racing T derailleur with wider 
gears.  You may be limited to 26T rear, and it certainly won't go over 28T. 
 
http://velobase.com/ViewComponent.aspx?ID=D667E8E0-9581-449F-9E24-7FC59D975684&Enum=108&AbsPos=27
  
Also, a short RD will not let you use a triple crankset, because there is 
no place to put the chain from the small chainring.  

On Wednesday, May 22, 2013 4:35:54 AM UTC-5, Joe Bernard wrote:
>
> Wow, I spaced bad on that one. Yes, he'll need matching shifters/derailers 
> for indexing. 
>
> On Wednesday, May 22, 2013 12:41:12 AM UTC-7, IanA wrote:
>
>> You could use a cassette hub or a freewheel hub providing it is 
>> compatible with the frame spacing (probably 130mm on the rear axle).
>>
>> Typically, you'll put a new chain on when swapping wheel sets (unless you 
>> use the same cassette/freewheel).  I wouldn't tear apart your 700 wheels. 
>>  Just start fresh with a new 650b set.  If you become 100% a convert to 
>> 650b, then you could rebuild the Phil hubs into new wheels.  
>>
>> In terms of compatibility - are you running indexed shifting?  If you can 
>> run friction, there is massive adjust-ability - basically an effortless 
>> swap where gearing is concerned.  If you have brifters or other indexed 
>> shifting, you'll need to check on what works with specific spacing.  This 
>> will need to take into account the shifters, the cassette/freewheel and the 
>> derailleur.  
>>
>>
>>
>> On Tuesday, May 21, 2013 2:38:14 PM UTC-6, Tim Gavin wrote:
>>>
>>> Is it possible to swap 650B and 700C wheels (and compatible brakes) on a 
>>> bike with minimal adjustment?
>>>
>>> I have less than 3mm clearance all around the 700x28's I have on it now 
>>> (picture).  The wisdom (kool-aid?) of the list has prevailed; I'm strongly 
>>> considering getting a 650B wheelset and compatible brakes so I can run 
>>> wider tires and fenders on my '97 Riv Road.
>>>
>>> I'm visiting a cool LBS soon that has a couple bikes with 650B, and 
>>> they'll let me do a fit check.
>>>
>>> I'm currently running a Shimano hyperglide freewheel cogset on a Phil 
>>> hub, with Campagnolo Racing T derailleur.  I like it; no problems and it 
>>> rolls very smoothly.
>>>
>>> If I build a 650B wheel, do I have to use the same freewheel cogs? 
>>>  Like, exactly the same model?  If I put a different 7-speed freewheel, how 
>>> much derailleur tuning would be required?  Could I put on an 8-speed 
>>> freewheel and still use the Campy derailleur?  Lots of tuning at that point?
>>>
>>> If there is no compatibility, I could tear apart the existing 700C 
>>> wheels and rebuild them with 650B rims.  This keep the plush Phil hubs and 
>>> the working cogs, but then I'm stuck with a rebuild again if I want to go 
>>> back to 700C.
>>>
>>> Tim
>>>  
>>>
>>

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