Seat Tube Length and Head Tube Length

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Seat Tube Length and Head Tube Length

Postby Krank » Sat Jan 05, 2013 8:25 pm

The measurements are for the 2013 Bianchi Oltre XR framesets:

Seat Tube -
53.5cm (59cm frameset)
55.5cm (61cm frameset)

Head Tube Length -
180mm (59cm frameset)
200mm (61cm frameset)


The 61cm frameset has a longer ETT by 1.5cm.

Given the same rider on both bikes riding the same race / event, would the bar height/saddle gap be the same on both bikes?

Would the above longer dims on the 61cm frameset only be attributed to longer rider inseam length ??


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by BNA » Sat Jan 05, 2013 8:52 pm

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Re: Seat Tube Length and Head Tube Length

Postby high_tea » Sat Jan 05, 2013 8:52 pm

Can't see how. The bigger frame would have 2cm less seatpost showing and therefore be 2cm lower relative to the bars. Or have I missed something?
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Re: Seat Tube Length and Head Tube Length

Postby Krank » Sun Jan 06, 2013 8:22 am

Thanks High Tea.

Others?

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Re: Seat Tube Length and Head Tube Length

Postby sumgy » Sun Jan 06, 2013 8:38 am

Not enough info.
There will be a probable increase in both stack height and reach of the frame but how much this will also be dependent upon the ST and HT angle of each.
I would assume that the BB drop and fork length for both bikes will be the same as this could also impact on these measurements.
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Re: Seat Tube Length and Head Tube Length

Postby Krank » Sun Jan 06, 2013 8:54 am

ETT -
57.5cm (59cm frameset)
58.5cm (61cm frameset)

Stack Dim (reach dim identical at 397mm) -
580mm (59cm frameset)
601mm (61cm frameset)

Head Tube Angle -
73 degrees (59cm frameset)
73.5 degrees (61cm frameset)

Seat Angle -
73 degrees (59cm frameset)
72.5 degrees (61cm frameset)
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Re: Seat Tube Length and Head Tube Length

Postby sumgy » Sun Jan 06, 2013 9:00 am

Krank wrote:
Stack Dim (reach dim identical at 397mm) -
580mm (59cm frameset)
601mm (61cm frameset)



Without redoing the figures, this seems to answer your question.
The front end will be 21mm higher.
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