I have always been somewhat concerned about the pins that hold the support tubes for the seat back for the Bacchetta Giro 20 in place. The pull pins are removable so the seat back angle can be easily changed. Both the ease of pin removal and the the fact that there was a slight wiggle movement between the inner and outer tubes concerned me.
Anytime there is continual movement for long periods of time (i.e. riding a bicycle cross country) between various metal parts wear/failure can occur. In this case, the pins could fail or fall out, the alignment holes could elongate (increasing the movement), or something else could happen.
While investigating underseat racks on the TerraCycle website I discovered some clamps that are made to ridgidly clamp the two seat back support tubes together, thus eliminating the removable pins and the vibration between the tubes. Plus, the clamps can be easily loosened to make seat adjustments.
I ordered the clamps for a Bacchetta bicycle (1/2″ x 5/8″), and they arrived within a week. It took me about 10 minutes to install the clamps; the instructions on the back of the card are detailed and self explanatory. To help me get the same tube location I replaced the removable pin prior to tightening the clamp; once tightened the pin was removed.
The first thing I noticed after installation is how ridgid the seat supports are. Before using the clamps I could grab hold of the rear rack with one hand and the top of the seat with the other and wiggle the seat due to loosness in the support tubes. Now the inner and outer tubes are one ridgid piece.
Would there have been a problem in this area on a long term bicycle ride? I don’t know. One thing for sure; there won’t be a problem now.
Note added 9/15/2013: On a recent cross country bicycle trip the other fellow traveling with me also rode a Bacchetta Giro. At about the 500 mile point I discovered one of the pins on his bike was halfway out and the strut holes somewhat distorted. We pushed the pin back in place and wrapped electrical tape around both pins to hold them in place.
Note added 10/22/2013: I added a set of these clamps to my wife’s TerraTrike Rambler after finding one of the pins on her bike half way out. Her bike required the 3/4″ – 7/8″ tube clamps.