Originally Posted by
sjpitts
Some more info:
The seat post in the little olmo is a 26.8. Does that tell us what type of tubing it has?
And here is a picture of the rear hub on the leader. I measured the spacing with it on the bike and it seemed to be 128mm. And it is a seven speed.
What kind of hub does that make it?
a 27.2mm seatpost is most typical for a bike with a 0.6mm wall thickness at the top of the seat tube (Such as SL, SLX, EL-OS). Provided the OD for the seattube remains unchanged, a 26.8mm seatpost indicates a tubing wall thickness of 0.8mm. As per the chart linked below, this is exactly the seattube deminsions of the strait gauge Aelle tubing set.
http://www.equusbicycle.com/bike/col...umbuschart.htm
The C-record rear hub was most likely originally a 126mm, standard sizing for 7-speed freewheel. It would be difficult to get an accurate measurement with the wheel in the frame. Remove the wheel and use calipers to carefully measure the hub width and also measure the width of the frame. If the hub really is 128mm, someone likely added 2mm of spacers to the axel nuts. If the hub is 126mm and the frame measures 130mm, you should add 4mm of spacers to the non-drive side, re-center the axel with the nuts on each side and re-dish the rim evenly. Exactly matching the hub and dropout spacing will keep the dropouts aligned paralled and make it less likely that you will break the axel (a common problem for freewheel hubs).