Bike wheel help for newbie I was wondering if someone could help me? I have recently bought a Specialized Allez Sport road bike (61cm frame) and due to my weight I’m looking to upgrade the wheel set straight away due to my weight 140kg. Having researched I have found that either Velocity Deep V or H Plus Son SL42 wheel sets would be suitable for my weight, but how do I know if they are suitable for my bike? Will they fit? Any help or advice would be greatly appreciated. 

Thanks in advance!
There are a few questions and answers on this site about wheel compatibility, but here is what you need to know in your situation.

Obviously you need ISO 622 / 700c rim brake wheels. 

Dropout spacing on the Allez Sport is standard road bike 130mm rear, 100mm front.

Rim bead seat width should be compatible with the tires you have, or intend to run. A beefier wheelset may have wider rims than those on the Allez. Note that rim width refers to the inner width of the rim where the tire bead engages. Searching on this site or the Internet will yield a chart of rim width to tire width compatibility.

As a heavier rider you may want to run slightly wider tires than the original 25mm. The Allez will probably accommodate 28mm tires. You can check by looking at the clearance between the current tires and frame.

Lastly, the freehub body that the rear sprocket cassette fits on only needs to be compatible with 9 or 10 speed cassettes. (11 speed cassettes require a wider freehub. 9 and 10 speed cassettes can be fitted with spacers, but 11 speed wheels will likely be more expensive.)

You actually have a massive choice of wheels available to you. Search this site for advice for wheels for heavier riders. Wheels aimed at touring bikes with high spoke counts (32 or more) seem to be what heavier riders go for.