Instruction: Analyze a question and its supporting document. Predicting answerability based on the information provided in the document. Output yes if the document contains relevant information to answer the question, otherwise output no.

Input:
Question: Does this rack order include the sliding lock as well?
Document: I had some reservations before purchasing this rack whether or not it would fit my bike (2010 Cannondale F5 size XL). No worries, it fits perfectly. Installation was no problem.I'm very happy with the Topeak BabySeat in general. It rides much lower than the Bell Cocoon that we previously owned.
We purchased a spare rack so we could move our daughter between bikes on long rides. The Topeak rack is extremely sturdy and I never worry about whether it will support the little one.This rack works on bikes with and without disc brakes. My bike has discs, my wife's does not. We use the same rack on both.
This rack works with the Topeak Baby Seat for bikes. This one fits the bikes with an internal rear hub - in other words and extra wide mount (not very common). Also be sure you are getting the right seat attachment - they have an old seat and a new seat and they clip on differently, therefore are not interchangeable. We had to buy three racks before we got it right! Now that it is on we love it!
Unfortunately, there is a fairly large difference between the sizes, so we were unable to get the rack completely level on either bike. Functionally, it's not a big deal. Aesthetically, I would just prefer that the rack be level.The rack is also useful without a seat mounted, though the square side rails make it less than ideal. It's fine for a trunk bag, but many paniers will not mount correctly.
The disc mounted rack and associated bike seat were easy to add to my bike. The instructions are clear, and there are many brackets included to work with any bike. The seat slides onto the rack smooth and is secure. My daughter loves that she can ride behind me, and I feel confident that she is safe in this seat. The bike can feel a bit off balance, but that is more due to having another person on the bike, than having this particular seat and rack.
This is a very high quality baby seat frame for a bike with disc brakes. Easy to assemble and attach. It came with all the hardware necessary. It should last many more years than my kid will be a passenger.
I solve this by pushing more with the center of my feet. I suspect that this won't be a problem for all users but it depends on bike geometry.
Answer: no