Claud Butler - Carpenter - Vintage Bike - Wheel Help

[vcballbat]

Using some high tech measuring equipment developed by NASA and a Regina 14-22 block I've got 45mm centre to tip and 5 teeth + ½ a gap + ½ a tooth

 

[Guinessisgoodforyou]

Using some high tech measuring equipment developed by NASA and a Regina 14-22 block I've got 45mm centre to tip and 5 teeth + ½ a gap + ½ a tooth

View attachment 733186View attachment 733188View attachment 733187

Looks like 21 is a safe maximum then, thanks for that mate. @WhtANightmare @vcballbat has worked it out

 

[vcballbat]

Looks like 21 is a safe maximum then, thanks for that mate. @WhtANightmare @vcballbat has worked it out

Looking at the Huret drawing it looks like 6 teeth in the ¼ and if I enlarge the picture and place my 22 over it appears to be bigger though this can be a bit deceiving, need the derailleur drop measurement.

 

[Guinessisgoodforyou]

Looking at the Huret drawing it looks like 6 teeth in the ¼ and if I enlarge the picture and place my 22 over it appears to be bigger though this can be a bit deceiving, need the derailleur drop measurement.

Agreed, just to be sure.

 

[Woz]

For a horrid moment then, I thought the tea straining spoon was some kind of essential NASA developed tool needed to wrench on old bikes

According to this from 1956: max sprocket spread 14 - 25, max chain-ring spread 8 teeth difference. Having the two maxed out sounds fairly optimistic to be honest. Think it was more common for a 22 max sprocket on a "race" bike.

I'd take a chance with a 24 max sprocket - they were available. It's very very rare to see more teeth than that and looking at my notes the Maillard Atom from the 40s and 50s never really changed capacity in 3, 4, or 5 speed.

https://forum.tontonvelo.com/viewtopic.php?t=19147

 

[Guinessisgoodforyou]

For a horrid moment then, I thought the tea straining spoon was some kind of essential NASA developed tool needed to wrench on old bikes

According to this from 1956: max sprocket spread 14 - 25, max chain-ring spread 8 teeth difference. Having the two maxed out sounds fairly optimistic to be honest. Think it was more common for a 22 max sprocket on a "race" bike.

I'd take a chance with a 24 max sprocket - they were available. It's very very rare to see more teeth than that and looking at my notes the Maillard Atom from the 40s and 50s never really changed capacity in 3, 4, or 5 speed.

https://forum.tontonvelo.com/viewtopic.php?t=19147

I agree, I'd be amazed if that mech coped with 25 teeth, should cope with 21-22 teeth happily. Happy days

 

[WhtANightmare]

From the drawing looks either 6 or 7 per quarter. So 24 teeth maximum sounds about right

 

[WhtANightmare]

@WhtANightmare if you measure the distance between the wheel spindle centre and the top of the mech cage, I will measure some freewheels.

Tha nks @Guinessisgoodforyou I'll try measure it a bit later today

 

[WhtANightmare]

My best attempt to get a photo of the measurement, not sure if I fully got the right bit or not, but if I did it looks to be close to 60mm max.

 

[WhtANightmare]

Using some high tech measuring equipment developed by NASA and a Regina 14-22 block I've got 45mm centre to tip and 5 teeth + ½ a gap + ½ a tooth

View attachment 733186View attachment 733188View attachment 733187

I like the cat for scale too this is some truly imaginative and impressive measurement technique