Which one fits you?

I have owned a Dimond Brilliant, Marquise and now a Mogul and unless another brand really takes my fancy I won't be swayed away from Dimonds. I wish I could bottle the first ride on a Dimond as the first thing you notice is having no rear stays the the dampening it does to your ride and I was looking for rough road to ride over. I have ridden the Pyrenees HC climbs including the Tourmalet and handles fine descending as well. Small things like the inbuilt bento and tool compartment on the Marquise is a sweet thing to have. TJ and Eric at Dimond are great to deal with and I like the fact especially now days I am supporting a small company rather than a giant company probably manufacturing in China.

I've never owned or ridden a Cervelo but a great bike that will get talked up I am sure but I am firmly in the Dimond camp...

I have to imagine you have all of the leverage in the world. You should be able to talk down either seller.

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Where are the Dimond frames manufactured?

Des Moines, IA

I’m a Dimond homer. Assuming both fit, the defining characteristic of the Marquise is it’s storage for Ironman racing, which is best in class. Other than that, they are both nice and very fast bikes.

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Dimond Bikes Superfan

I think both bikes are great, but for 4500 you might be able to build something new?

So for example, a QR PRfive frameset with a TriRig Alpha one bar, triRig brake calipers, Ultegra, some budget wheels, not too far off your budget?

Like this one:

https://forum.slowtwitch.com/..._vs._PRsix_P6811644/