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Frames road compacts? Why?

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Frames road compacts? Why?

Old 04-22-08, 08:44 PM
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k2krafty1
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Frames road compacts? Why?

Im not sure if other makers than bianchi offer these road compact models but just wondering why they have them? Is it made more for a woman? The tubing lengths have a big difference but the wheelbase stays the same. Fill me in!

https://www.bianchiusa.com/06_san_lorenzo.html

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Old 04-23-08, 01:08 AM
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My Giant OCR is a compact frame. One reason for this design is so the manufacturers can fit a wider range of cyclist with fewer frame sizes. The fit adjustments mainly become the stem length, and saddle height and fore/aft position, and of course, the saddle adjustments are free and easy.

One additional benefit is a lower stand-over height.
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Old 04-23-08, 02:22 AM
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Less weight?
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Old 04-23-08, 02:34 AM
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They claim to be stiffer than a traditional frame
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Old 04-23-08, 06:35 AM
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Yeah, there's no significant benefit in either direction (to the rider). Offering XS, S, M, L, XL, and XXL is a lot less expensive for the mfg. than 48, 50, 52, 54, 56, 58, 60, 62, and 64cm.
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Old 04-23-08, 12:03 PM
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Originally Posted by k2krafty1 View Post
Im not sure if other makers than bianchi offer these road compact models but just wondering why they have them? Is it made more for a woman? The tubing lengths have a big difference but the wheelbase stays the same. Fill me in!

https://https://www.bianchiusa.com/06_san_lorenzo.html
Strange (and incorrect) link for that question.

"San Lorenzo -
For the racer who prefers the classic look and fit of a horizontal top tube..."

But, yes, most of Bianchi's other models feature some degree of sloping top tube (compact). Bianchi is far from the only one doing this, it's very much 'mainstream'. New bikes with a horizontal top tube are becoming harder to find. As mentioned, the move seems to offer more benefits to the mfg. than the rider.
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Old 04-23-08, 12:16 PM
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Link doesn't work for me.

There was just a discussion on this though. My experience is this. I like cornering fast on the compact because I put my knee right over the TT and it clears it no problem. But that's about it. All the other arguments are refuted. It's stiffer yes but then you have a long flag pole of a seat post (so yes in a standing sprint perhaps its stiffer). Lighter yes but then add the huge seat post. Lower center of gravity is a useless argument.
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Old 04-23-08, 02:55 PM
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i like the look of a flat TT, so i hate this trend in frames!

luckily my newish ciocc has a flat top tube, so i'm a happy camper.
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Old 04-23-08, 04:07 PM
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Old 04-23-08, 04:17 PM
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Sloping top tube allows for greater adjustments and easier fits. You can have the exact same geometry as a non-compact frame if you adjust it correctly, or you can have a more upright posture than you possibly could with a non-sloping top tube. Before, standover height was a big issue with a lot of riders - compact frames allow for people like me, with bizarre body types, to comfortably ride road bikes.

I have short arms and legs, and a long torso. So I needed a compact frame with a zero-setback seatpost to be comfortably fit to a bike.
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Old 04-23-08, 04:39 PM
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effective top tube length is the single most important part of frame fit, but compact frames with XS, S, M, L, XL definitely puts a lot of riders in the middle of the sizes.
I know that for my height, I would be size M, but the effective top tube puts me on size S for a lot of makers, and even those aren't the best fit.
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Old 04-23-08, 10:30 PM
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Thanks for the feedback this forum is more responsive then the compact. (harhar korny I know)

https://www.bianchiusa.com/06_virata.html
So if im getting you guys right the new trend that has the sloped TT for the odd shaped rider and normal sized both to save $? And the normal sized riders would then go and get longer stems and and off set posts? The benefits you guys talked about stiffness, lower cfg etc have to be true and more reason than just cost and ease of production but I could be wrong. I say this Because in 06 bianchi made the virata that was specific "compact" for the odd shaped rider but yet all the other models still came with the slope-TT , but just longer than the virata. So As long as the C-T size is 59 on the old skool (heheh) frame and 59 on the compact frames Would the way you fit the bike change?
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Old 04-24-08, 08:23 AM
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Shorter top tube + shorter seat tube + shorter seat stays - longer seatpost ...should equal less weight, I'd think.
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Old 04-24-08, 09:28 AM
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Originally Posted by k2krafty1 View Post
Thanks for the feedback this forum is more responsive then the compact. (harhar korny I know)

https://www.bianchiusa.com/06_virata.html
So if im getting you guys right the new trend that has the sloped TT for the odd shaped rider and normal sized both to save $? And the normal sized riders would then go and get longer stems and and off set posts? The benefits you guys talked about stiffness, lower cfg etc have to be true and more reason than just cost and ease of production but I could be wrong. I say this Because in 06 bianchi made the virata that was specific "compact" for the odd shaped rider but yet all the other models still came with the slope-TT , but just longer than the virata. So As long as the C-T size is 59 on the old skool (heheh) frame and 59 on the compact frames Would the way you fit the bike change?
If the seat tube and headtube angles are the same, the virtual top tube is the desired length, and same with the headtube, they'll fit the same, regardless of the slope of the top tube.

I really wish people would get over the whole flat vs. sloping top tube thing. It makes absolutely no difference.
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