PROWHEEL 152MM/160MM/165MM/170MM/175MM Bike Crankset,46T/48T/52T Steel Chainring Bike Crank Arm Set,Double ChainWheel and Replacement Chain Guard,Compatible with City Bike,MTB,Electric Bicycle,Cargo

https://www.amazon.com/PROWHEEL-Chainring-ChainWheel-Replacement-Compatible/dp/B0CQFSPNJX yes you will need a crank puller any crank puller will typically be about the same quality

If he pedal strikes (clips his cranks and pedals against the ground a lot) or his knees hurt pedaling these are what’s on my bike right now, I can’t tell a difference riding between the two except that the 170mm clips a lot of curbs https://a.co/d/0b5lfu3O