Wasn't there a version of the Pro 5 Vis that had a larger bolt circle for the second chainring? Somehow in the far dark reaches of my brain there lurks the image of an outer chainring with a bolt circle that would accomodate perhaps a 40 tooth inner ring, and no smaller. In other words, the outer ring was designed to be used with just a second ring, no triple. Or am I just too far over the hill? ;-)
Peter Jon White Peter White Cycles 24 Hall Rd. Hillsborough, NH 03244 603 478 0900 Phone 603 478 0902 Phax http://www.PeterWhiteCycles.com
> Steve, the TA Cyclotourist triple cranks use the same set of holes to attach
> the middle and inner chainrings as to attach the inner ring on a double.
> When changing the crank from double to triple, you just need the triple
> hardware set with longer bolts and extra spacers, no need to drill extra
> holes. There was a TA model with a very large bolt circle (the Criterium
> perhaps), may have been a 151 BCD like 50's vintage Campy. But these also
> had the very small bolt circle where the outer ring attaches to the
> crankarm, identical to Cyclotourist, I think. The inner ring still attached
> to the outer ring. Even if you have one of these, which are fairly rare,
> the solution is to buy a full set of Cyclotourist triple chainrings,
> including a new outer, and bolt the new set to the crankarm.
> Jerry Moos
> Houston, TX
> ----- Original Message -----
> From: "Steve Neago" <email@example.com>
> To: <firstname.lastname@example.org>
> Sent: Monday, June 23, 2003 11:29 AM
> Subject: [CR]Campy & TA Triple cranks - threading for inner chainwheels?
> I own both Campy NR 144 bcd 5pin and TA Cyclotourist 6pin cranksets. I want
> to add the triple inner chainring drill holes to both of these crankarms.
> Does anyone know what are the appropriate metric tap sizes to properly
> thread the bolts for either Campy 36T or TA 36T inner chainrings? I have
> all the parts needed to accomplish this but having problems finding the
> proper thread sizes...
> Thanks, Steve Neago
> Cincinnati, OH