Giant own brand wheels.

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Racing 7's are a decent enough wheel but i wouldnt say a brilliant upgrade unless that is the maximum you can spend or needed a wheelset fast and that was all that was available! scrape another 20 or 30 quid together and get the 5's instead sir!
 

Arjimlad

Tights of Cydonia
Location
South Glos
I have just changed the Giant S-R2 /Shimano hubbed wheels on my 2011 Defy 2. Without cassette, tyres or skewers the rear weighs 1150g and the front 914g.

I bought the Mavic/Shimano 105 wheels advertised on here which feel like lovely quality. The weights are 1057g rear and 845g front, so I've only saved 162g.

But they feel really good !

OP - I'd encourage you to think about changing.

I did notice the difference on my ride into work this morning - first one with the new wheels. 105 hubs much smoother and I set a new PR on an uphill section. The bike felt faster and the stats show that it was.

I do like the look of the PSL-1 wheelset & it might be worthwhile looking at those. Otherwise I can recommend from experience, Mavic CXP-33s on Shimano 105 hubs with Sapim spokes.

I do now need to wash the bike though after muddy roads took their toll.
 
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