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29-03.-2003, 11:51 AM
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#1 |
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Registered User
Join Date: Mar 2003
Posts: 8
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Frame Geometry
I'm looking to buy a new frame, but I have some interesting geometry numbers I got from the manufacturer :
Size : 52.5 cm Top Tube : 53.5 cm Head Ang : 72 Degrees Seat Ang : 74 Degrees Chain Stay : 38 cm (really short) Fork Rake : 4.3 cm BB drop : 9 cm (wow!) BB Height : 25 cm (wow!) Wheelbase : 95.8 cm (short) My question is, with such a low bottom bracket height combined with short wheelbase and shallow head tube angle, how would the bike handle? My current frame is : Top Tube : 53 cm Head Ang : 73 Degrees Seat Ang : 73 Degrees Chain Stay : 41 cm Fork Rake : ? BB drop : 6 cm Wheelbase : about 98 cm My main concern is the low bottom bracket and shallow head angle making the bike handle too slow. However, does the short chain stay/wheelbase compensate for BB and HA? Thanks for the information. |
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31-03.-2003, 03:26 AM
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#2 |
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Registered User
Join Date: Mar 2003
Location: London UK
Posts: 25
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are you sure these figures are correct? these numbers seem very, well, outside the norm. BB drop is usually around 70mm giving a BB height of around 263 depending on tyres used, and the head angle of 72 would normally be matched with a 45mm offset.
Nevertheless, I'll draw it on a CAD program to see if the numbers you give will work. Neil www.billato.com |
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31-03.-2003, 07:48 PM
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#3 |
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Member
Join Date: Mar 2003
Posts: 45
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the chainstay is too short, i guess??? shortest i've seen is 39.5cm.
good for 650c maybe.... wheelbase too short. i think. bb height? is this some kind of sports car? hehe... is this a triathlon bike? I'll check the angles.... |
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31-03.-2003, 08:04 PM
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#4 | |
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Administrator
Join Date: Aug 2001
Location: Below Australia -20 years
Posts: 1,993
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Quote:
Thats what I was thinking: 74 Degree seat angle, 38cm chain stay lenght, 25cm BB height sounds like a tri bike to me. What sort of racing/riding are you doing idis? cheers! |
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01-04.-2003, 02:00 AM
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#5 |
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Registered User
Join Date: Mar 2003
Location: London UK
Posts: 25
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KACHUNK!!!!
 of course, it's the numbers for a 650c wheel frame. Haven't had to build one for a while, that's why it wasn't immediately obvious (to me anyway!) On the other hand, if it's not...... Neil www.billato.com |
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