My 40th birthday is rapidly approaching and I've decided to treat myself to a Cyfac. I've been riding full carbon bikes the last few years and currently have a full custom (geometry and carbon layup) frame. I've ridden a few carbon frames over the last few years and have realized that I simply dislike the muted feeling they offer. So, I've decided to go aluminum. The fastest bike I've ever ridden is a GIOS new A-90. It killed my back, but it was fast as hell. I've done my homework and it's pretty obvious that Cyfac makes arguably the finest aluminum bike on the planet. No,, this isn't the part where everyone else chimes in telling me what kind of aluminum bike is better. Cyfac, to me, is where it's at.
Ok,, my question. Which frame is stiffer. The Nerv with the carbon rear end or the proxidium with the aluminum rear end? I'm not comparing stiffness to weight or stiffness to comfort. I'm just simply looking for flat out stiffness. I do not spin. At all! I turn a rather massive gear. So stiffness is the most important factor and the reason I want an aluminum frame. Again,, this isn't the part where everyone else chimes in comparing BB stiffness of their carbon (or other) bikes. I'm looking for an uber stiff (pro level stiffness) frame that is artisan built.
I thank anyone in advance that has some first hand experience and apologize for perhaps coming across as abit of an ass. I've just seen too many really good threads on here go so far off topic that you'd swear it was CBC radio (fellow Canadians will get that one) due to people feeling the need to add their own two cents where it wasn't any help at all. In some cases, I can see it being helpful, this won't be one of those cases.
Thanks in advance!
Something tells me it's going to be "both", but in their own way. The Nerv "should" have the stiffer front end and the Proxidium "should" have the stiffer rear end. Which will likely have me just simply picking the one I want more.lol
It's an amazing frame, would get it again anytime. In fact, I'm trying to find an XS or two for my daughters
On the Cyfac site, the Nerv DS2 is around 150g lighter than the Proxydium. Absolu rear triangle, and the higher end fork. I liked the "standard" fork on the Proxydium (360g cut if my memory's good). Can't speak about the Nerv stiffness though. The Proxydium shure is STIFF !!! AND comfortable !!! Never had any problems with 120-140 km's rides.
I really miss the immediate acceleration of stiff, well made, well aligned aluminum. I've yet to experience it on a carbon frame. I see that they've flattened the seat stays to absorb vibration abit better. Thus explaining the way people seem to rave about the comfort of Cyfac's all alloy frames.
Also, do you find that the slack seat angle makes your 55cm top tube feel more like a 54?
I had two custom steel frames (road and Track) in the past and they both had 55cm top tubes, and around 73° STA for the road frame. That's the main reason why I bought the Cyfac, I was pretty certain with the fit.
My CF frame has 53.5 TT, with 74° STA, and I had to push the saddle very far back, and use a 120mm stem to achieve same position ( I run around 80mm saddle setback.
Fit is personnal, but I'd say up to 84cm inseam, and 5'11", I'd go M.
For 85cm inseam or higher, or both taller then 5'11'' with more than 84cm inseam, I'd go large...
Due to the geo, the difference in fit is minimal.
So base your choice on the required HT size.
I am 5'10 with a 85cm inseam, i usually prefer a saddle to bars drop of 8cm, saddle tip to bars is 55cm, saddle height is 74.7cm. I can fit well on either frame size.
Don't worry about model at all, call them, tell them what you want, they will make it. That's the beauty of cyfac. IMHO, I think over time a carbon rear end would not be as homogenous, but that's me.
Fwiw, your description matches a Gaulzetti more than any Cyfac.
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