RFC

I know that this is a quirky bike and an evolutionary dead end. But, at the same time fun.

Over all, the bike is in very good shape and the frame is interesting.

What is also interesting is that, somewhere in its history, someone installed a Campy crank with a single 49T chain ring. I haven't decided if I'm going to add a second chain ring. But, if I do, it is apparent that the crank/chain ring size for Campy is different than Shimano.

Another question, what is a cheap, serviceable front derailleur to look for on the bay?

And, one more: Could I use MTB thumb shifters with the derailluers?

Are there used Campy chain rings out there? How about compatible substitutes?

Thanks

RFC

kpug505

We need pics........I have a Nashbar and love it. So I am very curious what yours is. Mine has a triple triangle design like an old GT. I believe it was made by Shogun. Pics! Please?

RFC

I will shoot some pics this weekend. And, why don't you do the same. It sounds like the same bike. Please tell me more. How does it ride?

kpug505

Pics eh?

Bam!


I LOVE this bike! Rides great. Made of triple butted ishiwata tubes. Nice paint and clean lugs.
As for the chainrings......Notice my lil pic by my user name? Those are Sugino drilled rings on Galli cranks which Have the same BCD as Campy NR cranks. They pop up on ebay all the time NOS and can be had for less then used Campy rings. I think they are a suitable replacement but I am sure plenty of purists would flame me for even suggesting it......

My 2 cents
Kelly D.

T-Mar

ATB bars are often smaller diameter that road bars. Typically there is a 1.6mm difference but even this can vary depending on the exact make. Depending on the band construction of the thumbshifters, they may or may not work and you may have to substitute a longer bolt. For the ATB thumbshifters to work with your freewheel, you will have to find the required SunTour AccuShift, 6 speed versions or be willing to run friction.

Replacement chainrings will depend on which Campagnolo model you have. What is critical if the BCD (bolt circle diameter) dimension. This is the diameter of the circle that the centers of the bolt holes lie on, and there were several standards, The older Nuovo Record style crank used 144mm BCD and most manufacturers copied Camapagnolo and offered chainrings in this size: Gipiemme, Nervar, Ofmega, SR, Sugino, etc. What you need to do is measure the BCD and then search for rings based on the dimension. BCD can be be a bit hard to measure. Measuring the distance between the centers of two adcent holes is easier and for a 144BCD chainring, the distance between the centers of adcent holes is 84.6mm

Just about any front derailleur should work.

buddyp

loose screws carries a large selection of inexpensive chain rings in many BCDs

used chain rings are readily available too. There were boat loads of them at westminster. Check flea bay

RFC

Great information as usual. Thanks.

RFC

Kpug, thanks for the pic. The Aero Sprint has a very similar frame, however, it is a TT bike with a sloping top tube and 24" front wheel.

Tmar,

I am kind of intriqued with the simplicity of staying with a single chainring. I haven't cracked the bike open yet because I am trying to find time to finish the early 80's Bianchi Nuova Alloro. A couple of days ago, my 14-year-old son saw the Bianchi and claimed it as his own. Perfect result.

The Sprint has, what I am assuming is, a 5-speed freewheel. I have a 7-speed racing freewheel that I will install. Will I be able to get away with one chainring?

Thanks All

RFC

unworthy1

I guess that your frame has a 126mm rear spacing (6 or 7 speed) and not 120mm (5 speed)... if I guess right then the 7-speed racing FW will be fine as far as fitting in the frame. As far as the *gearing* that a single chainring and a "racing" FW will provide, that depends on how fit you are and what terrain you'll be riding on. Since it's a TT bike I reckon you won't be making any long tours with it. Also, this link might come in handy when you need a replacement 24" tire or tube, there isn't a huge choice out there:
https://www.terrybicycles.com/detail.html?item_no=24000