Comments on: Understanding Bicycle Frame Geometry https://www.cyclingabout.com/understanding-bicycle-frame-geometry/ Bikepacking, Bicycle Touring, Equipment, Testing, Videos Wed, 27 Dec 2023 16:30:06 +0000 hourly 1 https://wordpress.org/?v=6.4.2 By: Aquarama https://www.cyclingabout.com/understanding-bicycle-frame-geometry/#comment-4313 Tue, 19 Dec 2017 17:26:00 +0000 https://www.cyclingabout.com/?p=3948#comment-4313 In reply to Aquarama.

The “touring bike” steering geometry also helps in a cross wind. A “more responsive” geometry will allow the wind to fight your steering control.

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By: Aquarama https://www.cyclingabout.com/understanding-bicycle-frame-geometry/#comment-4297 Thu, 14 Dec 2017 19:16:00 +0000 https://www.cyclingabout.com/?p=3948#comment-4297 The *only* way to get shock absorption with a metal fork is to put more rake in it. A touring cyclist is going to want more absorption on account of the heavy load. Increasing the rake decreases the trail. Hence, the head tube angle must be slackened so that the rider does not have a twitchy, “zero trail” bicycle. That bicycle loses steering response on account of the head tube angle. A touring cyclist is happy with that.

Carbon fibers can be laid differently and flex can be designed into a fork. A carbon fork could be designed to have nice absorption with minimal rake. Then the trail calculations have a lot of options. Happy riding, everybody!!

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By: Alee | CyclingAbout.com https://www.cyclingabout.com/understanding-bicycle-frame-geometry/#comment-3436 Mon, 15 May 2017 08:14:00 +0000 https://www.cyclingabout.com/?p=3948#comment-3436 In reply to Bryan Harris.

– I found a geometry chart of a very similar bike from 1997 on RetroBike.co.uk.
– Many people spec a flat handlebar on the Surly LHT, that’s not really an issue.
– The Surly LHT will fit a 2.2″ tyre.
– ‘Sourcing a frameset’ refers to finding a second hand 20 year old frame and fork.

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By: Bryan Harris https://www.cyclingabout.com/understanding-bicycle-frame-geometry/#comment-3435 Mon, 15 May 2017 02:07:00 +0000 https://www.cyclingabout.com/?p=3948#comment-3435 In reply to Alee | CyclingAbout.com.

Interesting, thanks for the response!

How did you find the geometry specs for the Giant Rincon? I’ve been looking online and haven’t seen them anywhere.

The Surly bike you reference looks like a road bike (curl-around handlebars, etc.). I’m looking for something with mountain bike handlebars and wider tires. (Mine looks like this: https://files.bikeindex.org/uploads/Pu/11088/large_1998_Giant_Rincon.JPG )

You mention “sourcing a frameset” — what does that mean? I’ve never heard that term.

Thanks again!

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By: Alee | CyclingAbout.com https://www.cyclingabout.com/understanding-bicycle-frame-geometry/#comment-3426 Sat, 13 May 2017 01:06:00 +0000 https://www.cyclingabout.com/?p=3948#comment-3426 In reply to Bryan Harris.

You’ll find that the touring bikes of today share very similar frame geometry to mountain bikes of the 1990s. With a 71 degree headtube angle, 45mm fork rake and similar tyre dimension and seat tube angle – a bike like the Surly Long Haul Trucker would have to be the most similar ‘new’ bike.

Otherwise, I’d suggest sourcing a frameset from almost any brand from the same era. There was very little difference between most models in 1997.

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By: Bryan Harris https://www.cyclingabout.com/understanding-bicycle-frame-geometry/#comment-3424 Fri, 12 May 2017 12:25:00 +0000 https://www.cyclingabout.com/?p=3948#comment-3424 I bought a 1997 Giant Rincon in college (mountain bike, no shocks), and have always loved the feel of the bike.

Since then I’ve tried to find a “better” bike, but I haven’t been able to find one with the same feel. I presume it’s the geometry of that frame. I can ride easily without hands on that bike, but most other bikes I can’t. I just checked the trail of my wife’s and kids’ bikes, and they seem about the same. Wikipedia states that mechanical trail dictates whether you can ride no-hands (https://en.wikipedia.org/wiki/Bicycle_and_motorcycle_geometry#Mechanical_trail), but that doesn’t seem to be true for me.

With my Giant, if I just stand there and lean the bike left and right the front wheel follows, pointing left and right. On the others, if I lean the bike the front wheel goes hard to that side and won’t move if I lean the bike the other way.

1997 Giant Rincons are surprisingly rare. What would you do if you were me, wanting to find a new bike with a similar feel to that one?

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By: Alee | CyclingAbout.com https://www.cyclingabout.com/understanding-bicycle-frame-geometry/#comment-3332 Sun, 30 Apr 2017 23:17:00 +0000 https://www.cyclingabout.com/?p=3948#comment-3332 In reply to Michelle Pickrell.

Crank-forward bikes aren’t designed to reduce toe overlap. Depending on the model, they may even make toe-overlap worse. Crank-forward bike are designed with comfort in mind, allowing you to sit more upright. The downside to this style of bike is that they’re less performance-oriented than a traditional bike, and therefore tend to be better for covering short distances.

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By: Michelle Pickrell https://www.cyclingabout.com/understanding-bicycle-frame-geometry/#comment-3330 Sun, 30 Apr 2017 16:49:00 +0000 https://www.cyclingabout.com/?p=3948#comment-3330 In reply to Alee | CyclingAbout.com.

I stopped at an actual bike store the other day and the salesman there talked about a crank forward bike. I sat on one and it seemed comfortable but time constraints made it difficult to test out. How is a crank forward different from a regular bike? Would it work better than modifying a head angle?

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By: Alee | CyclingAbout.com https://www.cyclingabout.com/understanding-bicycle-frame-geometry/#comment-3285 Mon, 24 Apr 2017 00:44:00 +0000 https://www.cyclingabout.com/?p=3948#comment-3285 In reply to Michelle Pickrell.

Hi Michelle. Toe overlap is pretty common on all bikes, especially in the small-mid sizes. You can avoid it somewhat with a slacker head angle, a longer fork rake and smaller wheels. Trek make their bikes with slacker angles and longer rake, and the wheel sizes are matched to the frame sizes. (ie. 27.5″ wheels on bikes under 15″). Definitely check them out.

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By: Michelle Pickrell https://www.cyclingabout.com/understanding-bicycle-frame-geometry/#comment-3221 Thu, 13 Apr 2017 16:17:00 +0000 https://www.cyclingabout.com/?p=3948#comment-3221 I would like to get back into cycling but I can’t seem to find a bike that fits me. I can’t buy extremely expensive bikes so I shop at the local department store. The issue I’m having is that even with so called 29″ bikes. My feet still end up hitting the front tire when I turn. I’m guessing that I need to find a bike with more head tube angle but I can’t seem to find anything like that. I would love any recommendation that could be offered.

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