I recently accidentally stripped the bold on my Shimano Tiagra derailleur. The shop replaced the derailleur but put in a 9 speed Shimano Derailleur instead of a 10 speed that comes with my bike.



I was given the Shimano Tiagra Rear Mech 9sp 4500

Shimano Tiagra Rear Mech 9sp 4500 | Chain Reaction Cycles

My bike comes with the: Shimano Tiagra 10-Speed Rear Road Bicycle Derailleur - RD-4601

Shimano Tiagra 4601 10 Speed Rear Mech | Chain Reaction Cycles

I feel the gearing on the 9 speed is all over the place especially on the high and low end of gearing.

I'm going to confront the shop about this.

2. I feel I should be given a full exchange because they gave me the wrong derailleur that is not the EXACT replacement which came with my bike. I instead received an older one that is not the right amount of gears. What does everyone think?