Hi all - new around here and hope this is an appropriate place for this. A deal came up on a Bianchi Infinito, 59cm frame, and wondered if it sounded ok for size. I put in my measurements on the competitive cycling link in the stickies, and here's the data:

YOUR MEASUREMENTS

Actual Inseam 34 In
Trunk 25.5 In
Forearm 14.5 In
Arm 26 In
Thigh 24.5 In
Lower Leg 22.25 In
Sternal Notch 58 In
Total Height 70.75 In

And for the Eddie Fit size:
Fit style
The Eddy Fit
Top Tube Length 55.5 - 55.9 Cm
Seat Tube Range CC 58.4 - 58.9 Cm
Seat Tube Range CT 60.1 - 60.6 Cm
Stem Length 10.5 - 11.1 Cm
BB Saddle Position 77.6 - 79.6 Cm
Saddle Handlebar 55.9 - 56.5 Cm
Saddle Setback 7.7 - 8.1 Cm
Seatpost Type Setback

I don't have any experience with riding road bikes, but looking to move to road from my hybrid... tired of beating the headwinds head on Most rides are in the 12-25 mi range on long country roads around here.

Main concern is if the frame is too large for me or not. I'm ok on the old clear the bar for clearance, Clarence, but I know you all have more mystical ways of devising sizing than that.

FWIW I can ride from 54-58 and I have a 32" inseam. I think you will find there is a range that will work for you. My Masi is a 58 w/58 TT and my Guru is a 55 w/55 TT. I am fine on the Masi but the Guru fits perfectly. I'm guessing you would be pretty good with a 59 given your inseam. You are about 2" taller than me so I'm guessing your reach would be OK with a TT up to 59 as well. It seems to me you are in the range. From there a good fitting could dial it in.

BTW the Cyrille Guimard (Greg LeMond's coach) method would put you on a 58.

Nice bike.

It seems like every bike company has different sizing and the dimension that matters most on fit is NOT the seat tube length. Assuming you have enough standover or you are comfy enough a rider to angle the bike and come off the saddle to put a foot down, it's often irrelevant.

All that said, the Bianchi has compact geometry and seat-tube based sizing, as you can see here: Infinito Ultegra Di2 | Bianchi USA

Notably, the "59" has a 57.5 top tube. This makes it notably more likely to fit you.

By way of comparison, I'm 6'3, and need a 58.5-60 cm top tube. I also have very long arms, which means I can tolerate a lot of drop and I like long stems.

I'd suggest you go out and measure your hybrid. Virtual top tube, seat tube, BB spindle to saddle, and perhaps saddle-nose-to-stem-clamp. That will give you a good baseline so you know how the fit will be different on this thing.

Looking at Bianchi's geometry, I would be more concerned about the top tube being too long than seat tube length. The 59cm frame has top tube length of 57.5 which is almost 2cm longer than the CC fit calculator recommends. That means you will have to get short stem or riding stretched out. Being new to road bike and coming from upright riding position of hybrid, I think your back may not like that.

It looks like you used the Competitive Cyclist fit calculator? It showed I needed a 53.1-53.5 top tube with an Eddy fit. I'm 5'10" and have had everything from a 54-58. My 57 with a 90mm stem (ST is 54c-c, 58c-t and a slack seat tube angle) is the best fitting bike I've ever had. No way would I go shorter than 54.

Thanks all - yes, I used the calculator. I had a hard time figuring out the fit based on the tiny diagram on bianchi's website. I ride a trek 7.3 fx right now on a 22.5" and it's killing my left hand under the knuckle on the ring finger after riding and during the ride, my hands go numb. I think it's because that bike is too long for me and there's too much pressure on my hands. I rode that bianchi and there's way less pressure on my hands, but I don't know how to judge proper size by riding around a parking lot and I don't have experience with a road bike.

For reference, the particulars of measurement on that bianchi are here: Infinito 105 | Bianchi USA The diagram has B1 and BS and I'm not sure which one to use. The TT measurement on the competitive fit calc says I should ride a 55.5 - 55.9

Riding a flat bar bike on the road for long distances would probably kill my hands, too. With drop bars you have a lot of room to move your hands around.

The top tube length will fit him just fine. The measurements on the "eddy fit" give him 2cm of "wiggle room" on seat height, almost half a mm on setback and over half a mm on seat to bar reach. Then there is over half a mm on stem length.

OP, when you get this bike, fitting will be simple. Set the seat height and setback. Once those are locked in where the calculator puts you, measure the "saddle/handlebar" position. I'm guessing a 100mm stem will be what you need to get the reach it recommends.

There's no gurantee that a calculator works for everyone but if we use if literally the top tube length is a problem. The Eddy fit has a top tube almost 2 cm shorter than the Bianchi. Forgetting about saddle position, the calculator recommends a stem length of 10.5 to 11.1. There's a good chance the OP will need a shorter stem that's outside this range.

That's really not a lot but its something to consider.

Based on fit calculator and bike's geometry it would put OP on a 55 or 57 Infinito. The 59 would be ridable with a short stem but probably not ideal. Don't talk yourself into an ill fitting bike because it's a good deal. Besides Bianchis are overpriced so it's probably not really a good deal

On the diagram Infinito 105 | Bianchi USA Is top tube B1 or BS?

Your experience of the size based on height means exactly nothing to him unless you guys have similar torso and arm lengths.

I love the certainly of interwebz bike fitting. Seriously, you don't know that at all, and the dimension from CC are typically pretty good based on what he entered, and in this case his upper body and arm dimension. And it spits out the number that's almost 20mm less than the top tube of the Bianchi. Yes, I know you can go to a 70/80mm stem to compensate, but that would impact his handling to some extend. Since OP is starting for scratch for a road bike, why not get something that's a better fit.

BTW, my experience with Bianchi is that they have longer top tube with that stretched out racer fit. And also, OP, make sure there is enough steerer tube left above the headset. Your back will thank you for that.

Most people would use B1 as the effective length

B1. You want effective top tube as a measurement. It's what it is on a horizontal plane.

BS is the actual tube length, but it's slanted. And I can't resist: BS, for this, is mostly BS. I slay me.

LOL.. where's the rimshot button... So, judging from the bianchi site, it looks like a 55-57cm frame would be more appropriate. Thanks for the help y'all. I'll work on patience.

It recommends a stem that is 110mm based on the top tube given. 110mm - 2cm = 90mm.

This fit calculator is based on simple geometry. If the measurements of his body are correct, the resulting numbers are spot on for his "optimum" fit.

I thought that was a joke for a moment. B1 is the dimension you should be paying attention to, otherwise know as "virtual" or "horizontal" dimension. Plus, I'd recommend selecting the race fit option rather than the Eddy fit on the size calculator. I think that would put you more in line with what works for the majority of people. It recommends a 55.6-56cm top tube for you. As was mentioned, that's a size or two down from the 59.

^^^^^^^I agree with this. It could be made to fit you, but on the extreme edge of being able to do so. That could make your good deal not that great after all... A 57 frame with a 110cm stem would get you placed comfortably on the bike with good latitude for fine tuning adjustment.

Good luck with your new bike!

There are a lot more going on here than just the top tube and stem, really. The OP can also choose a bar that's short. The most important number he should be paying attention to is saddle to hoods (if he rides the hoods) distance after the saddle has been adjusted with correct offset from BB. Unfortunately all the geometry info Bianchi provided is not enough to dial that in, and it's probably something he has to do by trial and error over a period of time. My hunch is that he will be really stretched out with this frame with regular stem and handlebar. Given that, like a lot people already said here, why not starting with something in the middle of the range in term of frame size instead of going to the extreme larger end.

OK - I was wondering about Eddie vs Race. Not sure if this matters, but hip flexion is a little difficult for me. I broke my back 3 years ago and had a spinal cord injury, so flexing the left hip up tight is hard. No worries, I can beat down like hell on the pedals! However, I was wondering if the Race would have my body more horizontal, requiring more flexion of the hip?