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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 11-18-10, 11:47 PM   #1
MbruceL
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How much does frame geometry matter?

I'm not talking about a huge difference, just a slight one.

Excuse me if I dont use the proper cycling terms... but I've decided I want a fixed gear bike. While looking at Framesets I've found a few that I like, however the one I'd rather get (because of price) has a slightly different geometry, and I dont know how much it will effect the bike as a whole.

Here's the main two I'm looking at:

The Eighth Inch Scrambler V3- http://www.eighthinch.com/scrambler_frame.html

and the Mission Valencia- https://www.missionbicycle.com/frame

Now, I THINK I would prefer the top tube to be flat or slightly sloped downward for a LITTLE bit more aggressive geometry, however the Scrambler frame seems to have an almost upward sloped top tube... it's so slight that it's hard to tell in many of the pictures. and the Valencia looks to be slightly sloped downwards... So, do you all think that it matters for the price difference?? Would I really even notice much of a change with the different geometry?

What do you all think?? and if you have suggestions for other fixie framesets around the same price range I'm all ears, but I've read a ton of old forums on the topic of cheap fixed gear framesets, so if you have a suggestion please include some reasoning to help me decide.

thanks alot!! I appreciate any help.
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Old 11-18-10, 11:53 PM   #2
Squirrelli
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Define "aggressive geometry".

I hear it used a lot, but what exactly is "aggressive"?
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Old 11-19-10, 12:00 AM   #3
MbruceL
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downward sloped toptube as opposed to upward sloped toptube. I included that in my post.
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Old 11-19-10, 12:06 AM   #4
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Aggressive refers to short stays and steep headtube and seattube. It has nothing to do with the angle of the top tube.

Last edited by Kayce; 11-19-10 at 12:12 AM.
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Old 11-19-10, 12:10 AM   #5
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Downward slopping top tube does not necessary translate to aggressive geometry; upward slopping top tube, or compact geometry, can also be "aggressive".

You could achieve downward slopping top tube simply by buying a new fork with different length and/or add 650c wheels. The handling will be very jittery and shaky, though.

Neither of the frames are very aggressive, if you want the downward slopping look, get the Affinity Lo Pro.
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Old 11-19-10, 12:11 AM   #6
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It depends on all kinds of factors: riding style, aesthetics and the bike build.
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Old 11-19-10, 12:12 AM   #7
MbruceL
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Oh, thanks. As I also said in my post I dont know what alot of cycling terms mean. (although I thought I knew that one haha)

So, would you consider the Scrambler any less aggressive than the Valencia?
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Old 11-19-10, 12:13 AM   #8
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Quote:
Originally Posted by Vixtor View Post
Downward slopping top tube does not necessary translate to aggressive geometry; upward slopping top tube, or compact geometry, can also be "aggressive".

You could achieve downward slopping top tube simply by buying a new fork with different length and/or add 650c wheels. The handling will be very jittery and shaky, though.

Neither of the frames are very aggressive, if you want the downward slopping look, get the Affinity Lo Pro.
Thanks!
I'll check it out
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Old 11-19-10, 12:19 AM   #9
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Comparing the dimension on the 55 scrambler and the 56 valencia(just those two cause Im lazy some times). The scrambler is slightly mor aggressive. Since there is a lot of confusion of what aggressive means, do you know how they handle differently(theoretically, there is such little difference between the two)?
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Old 11-19-10, 12:22 AM   #10
MbruceL
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Do you mean aggressive handling vs. less aggressive handling?

Correct me if I'm wrong, but doesn't an aggressive geometry give you quicker handling, more nimble a little less 'stable' ect.??
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Old 11-19-10, 12:26 AM   #11
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I should point out that Scrambler's forks are 30mm in rake, which will affect how the bike will steer.
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Old 11-19-10, 12:30 AM   #12
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Quote:
Originally Posted by Vixtor View Post
I should point out that Scrambler's forks are 30mm in rake, which will affect how the bike will steer.
How exactly would that affect it?? And I apologize if I sound clueless... but I am. apparently even more so that I thought. haha
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Old 11-19-10, 12:38 AM   #13
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If I am correct, the less the rake, the more the trail, the more stable the bike it is at speed but will not be very lively at low speed.

David Moulton have a very cohesive article on fork rake and trail.
http://davesbikeblog.squarespace.com...f-history.html

More to read about how a bike handles by David Moutlon.
http://davesbikeblog.blogspot.com/20...rrelly_30.html
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Old 11-19-10, 12:41 AM   #14
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Quote:
Originally Posted by Vixtor View Post
If I am correct, the less the rake, the more the trail, the more stable the bike it is at speed but will not be very lively at low speed.

David Moulton have a very cohesive article on fork rake and trail.
http://davesbikeblog.squarespace.com...f-history.html

More to read about how a bike handles by David Moutlon.
http://davesbikeblog.blogspot.com/20...rrelly_30.html
Thanks! I'll read both of those. I seriously appreciate it.
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Old 11-19-10, 10:48 AM   #15
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Urban Velo also did a nice easy-to-understand geometry guide in Issue #3.

Quote:
Originally Posted by Vixtor View Post
....David Moulton have a very cohesive article.........

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Old 11-19-10, 10:56 AM   #16
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I know, my English sucks...


Very unpleasant picture to look at.
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Old 11-19-10, 10:58 AM   #17
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Cool disc "Break" picture
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Old 11-19-10, 03:33 PM   #18
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My Lo pro has fairly slack angles considering the aggressive look. I believe the headtube angle is 72-73 with a 43mm rake fork.
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Old 11-20-10, 11:38 PM   #19
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If you don't know what makes a frame "aggressive" then it isn't something you should be worried about when buying your bike. Pick something in your favorite color.
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Old 11-20-10, 11:57 PM   #20
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If you don't know what makes a frame "aggressive" then it isn't something you should be worried about when buying your bike. Pick something in your favorite color.
+1, "aggressive" isn't always the best for the street anyways and it wont even matter if you bike around the park all day. Get the one that looks the best.
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