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Frame Size help please


Veebee

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Hi Guys.

 

Looking for advise please on finding the right size frame for my next bike. I am stuck in the middle of frame sizes and not sure which way to go.

 

Current bike: Silverback Sirelli 2 road bike - Size L - 56cm

Looking to buy Swift Carbon - Ultravox SSL - Size M - 54cm

I am testing a Swift Size large at the moment with a 90mm but the reach to the brake hoods are just too far, I would need to use a 60-70mm stem to be ideal fit.

 

Need advise from the more experienced please. My gut tells me to go with a Medium frame Swift and run longer stem and 1 x additional headspacer if needed to bring the front end height up.

 

Current bike set up

post-67394-0-81677800-1561202500_thumb.jpg

 

Planned set up for Swift Uvox

post-67394-0-27136100-1561202508_thumb.jpg

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I would agree on the smaller frame with longer stem. use a 110mm stem on my size 53 pinarello, and it really is the most comfortable bike I have ever ridden. there are some oddities with pinarello sizing, but I usually ride a 56.

 

Having said that, each bike has its own unique characteristics and your results may obviously differ. :) M is going to be more responsive and feel lighter, L will be more stable at high speeds and may descend better.

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Will it not be possible to test both iterations? That way it removes the guesswork from the equation. You may just love the large with shorter stem. You may prefer the medium with the longer stem.

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Will it not be possible to test both iterations? That way it removes the guesswork from the equation. You may just love the large with shorter stem. You may prefer the medium with the longer stem.

 

kinda a mission at the moment with Swift being Cpt based only. They sent me down a Large on my request which has proven to be a tad too big.

 

Side by side with my silverback, the large swift is much bigger.

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I would agree on the smaller frame with longer stem. use a 110mm stem on my size 53 pinarello, and it really is the most comfortable bike I have ever ridden. there are some oddities with pinarello sizing, but I usually ride a 56.

 

Having said that, each bike has its own unique characteristics and your results may obviously differ. :) M is going to be more responsive and feel lighter, L will be more stable at high speeds and may descend better.

 

yeah thats a bonus after getting the right fit.

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The medium for sure. The Silverback in Large is a more traditional size ST563/TT560, but the Swift in Medium is a compact size ST540/TT553, and the Top Tube measurement is the one that I'd be most concerned about. 7mm is not a lot to make up. Same with the reach differences, less than 10mm. Try it out with a 100mm stem to start and it should probably be pretty close to your old ride.

 

Having said that, each bike has its own unique characteristics and your results may obviously differ. :) M is going to be more responsive and feel lighter, L will be more stable at high speeds and may descend better.

This is actually an interesting comment. When you go look at the charts, the Large Silverback actually has a shorter wheelbase than the Medium Swift. 989mm vs. 997mm. Probably comes down to the Swift's slightly slacker head angle, which should provide for a less twitchy front-end.

Edited by bertusras
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Yeah, that's what I'm leaning towards as well. Would still be great to test both.

Why. Short stems don't work on road bikes in bunch riding. This is no brainer. The medium with longer stem.

any road bike with a stem under 100mm is just too twitchy in the wind.

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