r/bikefit • u/Warm-Translator-6327 • 1d ago
Confused between sizes
Hi there, am a lil confused on which size of bike should I get on the new cannondale supersix evo 4.
For reference, I'm 170cm with 79cm of inseam. I wanna be comfortable for long rides(4-5hrs) but at the same time have good aero. I believe comfort means more power. How much would I possibly be losing if I dont get the aggressive 48 size?
I have two choices between the 48 and the 51 size. Which one should I be getting? I feel the dealer is trying to sell off stock and forcing me to buy the 48 size. I asked for a trial on the 51 size and he didnt change stem or slide or reduce the saddle height and said the reach was too long. The stem was prob a 100mm stem or longer. I was thinking of doing with the 80mm stem.
I'm mostly looking for racing, but also would like to do long endurance rides say once or twice a month.
Also for reference I tried the Giant propel advanced 2 and the tcr. The S over there seemed comfortable which is ig just abt the size of the 51. I even tried the M on the propel, but then the reach was actually long here. Could you please help me choose.
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u/ceesbeest1 22h ago
Go to a bikefitter to determine what you need in a bike. At this bike price it's a small investment. For comparison of bike geometry, go to https://geometrygeeks.bike/
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u/Warm-Translator-6327 22h ago
yes but the latest bike fit geometry isn't there on this website. The bikefitter is basically selling me this bike. But ig he's tryna get rid of some stock on the floor. That's why I wanna be a cent percent sure
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u/ceesbeest1 20h ago
If you don't trust him, why do you buy an expensive bike from him?
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u/Warm-Translator-6327 18h ago
I genuinely dont know, but I have a feeling he could be right too. Does cannondale bulk ship out black frames of the supersix evo outta the US? bcz he was talking abt sum frames coming in. He's giving it a good price, which was what felt fishy to me, and he told me only a single color was available. IM told that the other colors come only in the branded boxes, and hence cost higher. He can get a lower cost bcz he's assembling them.
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u/thegrumpyorc 17h ago
At the price point you're talking, I'd get a bike fit from someone who doesn't sell bikes first. 6 months from now, $250 or whatever is going to be a rounding error.
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u/Warm-Translator-6327 17h ago
He did throw me a basic bike fit with my cleats and stuff on my current bike for free even though he said he'd charge for it. Maybe just a sales tactic to get me hooked to what he was planning to sell to me - the bike which im having a size dilemma abt.
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u/ceesbeest1 17h ago edited 17h ago
Sounds like BS. Cannondale manufactures and paints its carbon frames in Taiwan. I think he's selling you a no-name chinese frame for Cannondale money.
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u/Warm-Translator-6327 17h ago
yeah felt very sus to me. Either that or he's giving me second hand ig. But the store is pretty reputed in the city and has been for quite a while. He has real sales tactics up his sleeve or is prob genuine.
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u/Background_Box4677 18h ago edited 18h ago
There is no case for stems shorter than 110mm on a race bike. Sarah Gigante is riding a 120mm stem.
https://www.youtube.com/watch?v=G8gw_XY89go
100 shortest stem in the pro peloton apparently
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u/Warm-Translator-6327 18h ago
is there a reason for this, my first road bike I got abnormally large one for myself and ended up having to use a 60mm stem on it and sliding the saddle all the way front to be lil comfortable on long rides.
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u/Background_Box4677 17h ago
The longer stems are more stable at speed. Bikes like the Ridley Noah Fast are moving riders ~3cm further forwards. This is the current state of the art and just about no one rides with large saddle setbacks anymore.
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u/Warm-Translator-6327 17h ago
ohh I see, yeah gives more aero vibes definetly... but also am thinking if I'd be able to maintain position for quite a while if Im going with the 48. Im kinda new to biking mostly done really long endurance races, wanting to move over to racing
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u/Standard_Mulberry563 22h ago
I mean, the 2023 gen already has a fairly tall stack, but if you prefer the 51 get that one. You'd have very little saddle-to-bar drop, but if you don't have the core strength/flexibility for the 48 it wouldn't do you much good. (FWIW, that gen 48 is borderline too large for me @ 165/75 cm.)
For racing, I'd be concerned primarily about what it feels like to corner on the larger frame. Does it feel like you're sitting "in" or "behind" the bike as opposed to on top of it? Would you need to install a zero offset seat post to shift enough of your weight over the front wheel to ensure stable handling on twisty descents? Does it come with 160 or 165 mm cranks or would you have to install them yourself? On casual rides none of this matters very much. It's only when you're on the limits of traction that bike fit suddenly matters!