WTB vs. Giant wheelset

[Koos Likkewaan]

Good morning,

 

Looking for some advise on which wheelset to use.

 

I bought a 2016 Giant XTC carbon. It came with WTB ST i19 wheelset. It seems that this wheelset weight is around 1,900g from the info that I can find. Also comes with shimano SLX hubs, so no sealed bearings.

 

I am concerned that I am to heavy for these wheels ( around 90kg's )

 

I am thinking of replacing them with a set of P XC2's that I have. Weight on these seems to be around 2,100g, and have sealed bearings. Currently using them on a heavier alu bike, and find them to be bombproof.

 

My questions are:

 

1) How accurate am I with the weights ? 

2) Would I feel the difference in performance if I go a little heavier, being only a mid pack rider ?

 

Any advise will be appreciated.