Geoffrey Butler

[southcoast]

What is the rear dropout spacing at the moment 120 or 126?

 

[funk2monk]

Someone has lightened the crank arms . Later third party chainring. I used Sugino rings on my Campag cranks.

You can buy longer chainring bolts and chance an inner ring on the Pista and you will most likely need a longer axle. The inner ring will not be supported so not something I'd recommend.

For double chainrings I'd think about a new set of cranks / rings. Plus the matching axle.

Just found this on eBay?

 

[midlife]

Yep, pista cranks with single ring. A tad expensive but yours is worth a Bob or two..... That's the longer crank beloved of TT riders. The track boys usually used 165

 

[carpenter]

Just found this on eBay?

😲

 

[carpenter]

By the way, I'd stick with the single chainring - or go fixed, we both know you want to

 

[funk2monk]

😲

I know!

 

[funk2monk]

What is the rear dropout spacing at the moment 120 or 126?

Good morning,

Just measured and its 120mm.

 

[southcoast]

Good morning,

Just measured and its 120mm.

This ties in with the bike being from the early seventies. Later bikes would have been 126mm.
I tend to run my 120mm bikes with either 5 or single speed, although have owned ten speed ones in the past.
As mentioned by @midlife a conversion to a double front crankset with a suitable new axle, would be the best way to get more gears.

 

[funk2monk]

This ties in with the bike being from the early seventies. Later bikes would have been 126mm.
I tend to run my 120mm bikes with either 5 or single speed, although have owned ten speed ones in the past.
As mentioned by @midlife a conversion to a double front crankset with a suitable new axle, would be the best way to get more gears.

The wheel I removed has a 5 speed cassette on a large flange Campagnolo hub.
think I will stick with this set up.

 

[midlife]

The rear wheel will have a freewheel and not a cassette. If you want to change it the way they work are different needing different tools and kit. Just out of curiosity does the skewer have a straight and not curved lever?

 

[Hover Fly]

As far as I know Williams only made 151mm BCD chainwheels (other than steel 3 and small 5 pin types) something to consider if you’re considering doubling.

 

[midlife]

Williams branded chainrings were available for Campag cranks BITD, but the older 151 BCD. Need to check on velobase about the BCD of older pista cranks. The plot thickens

 

[Hover Fly]

Older Campagnolo were 151 until 1967.

 

[southcoast]

The wheel I removed has a 5 speed cassette on a large flange Campagnolo hub.
think I will stick with this set up.

Yes I would stick to 5 speed. A double crankset, rings and bottom bracket, of similar quality to what’s already on there is not going to be cheap.

 

[midlife]

Not sure my knees, legs and lungs could cope with a 5 speed set up any more lol. Something new like a reasonable Suneace double chain set is less than £50 and unbranded even cheaper.