I swapped out the aluminum mast cap on my 5.1 with a carbon mast cap. The aluminum cap started a noise (ping) that resonated through the top tube.
Surprisingly I've got along well with the bontrager saddle after I took off the plastic piece that surrounds the seat. After a 7 day bike tour and a sore bottom I figured out it was because of where my posterior contacted the plastic.
I saved my bontrager folding tires for a rainy day and put on continental 4000.



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