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15
votes
3answers
9k views

Explaining the effects of frame geometries

I asked about buying a bike here, and someone asked on my behalf about test-riding a bike before buying. My question is, what should I know, or should have known, about the sizing or 'geometry' of a ...
11
votes
1answer
2k views

How is stem length measured?

How is the length of a stem measured? Where does the measurement start and finish?
11
votes
2answers
301 views

What is the difference between a horizontal top tube and a sloped one?

Some comparable bicycles have a crossbar (top tube) that's horizontal: Others have one that's sloped: What are the reasons for either frame design? Is it merely style preferences? Or is there ...
10
votes
3answers
4k views

Does inseam of pants convert to stand over height of a bike?

If I know my jeans size, for instance 32", 32", can I convert this into an estimate for standover height on a bike?
9
votes
4answers
5k views

What effect does head tube angle have on a bicycle?

My girlfriend and I are looking at a new bike for her. The one we're looking at has a 70 degree head tube angle while her current bike has a 70.5 degree head tube angle. Unfortunately, none of the ...
7
votes
1answer
2k views

Touching the front wheel with my foot when turning

My girlfriend got a new city bike today and she touches the front wheel every time she has to make a hard turn. Is there anyway to avoid this besides replacing the whole bike? LATER EDIT: I think I ...
6
votes
2answers
699 views

How to choose between a race bike like a Madone and a classics bike like a Domane

I ride regularly for exercise in New York City but do not race. I currently ride on a steel frame that handles the rough roads easily. I want to buy a carbon bike and am torn between a "classics" bike ...
5
votes
1answer
237 views

S shaped down tube (MTB)

Are there any advantages of S shaped down tubes over the traditional ones on MTB? For example: what do you think of this design? Jamis Exile Comp 2013
4
votes
2answers
416 views

How to stop foot clipping front mudguard

My feet overlap the pedal and clip the front mudguard when I'm turning at a low speed because I have to turn the handlebars wider than normal. My foot doesn't clip the wheel when the mudguard is ...
4
votes
2answers
2k views

How does a chainstay length affect a mountain bike performance? (wrt: 26", 650B, 29r)

The trade offs for 26" through to 29" with respect to rolling resistance, contact patch, obstacle rollover, etc... have been well discussed. However, it occurs to me that as the rear wheel gets larger ...
4
votes
2answers
3k views

What benefits does a tapered head tube afford?

I've just read a review of Tom Zirbel's Jamis Xenith SL on Bike Radar and flicking through the pictures there is one of the head tube with the following caption: Tom Zirbel's (Jamis Sutter Home) ...
4
votes
1answer
2k views

What would be the “definitive” formula to calculate chainstay length from sprocket size, chainring size and number of chain links?

Before I started to write this answer, I thoroughly read this question, its answers and comments: How do I calculate the diameter of a chainring from the number of teeth? So, my question tries to ...
3
votes
2answers
1k views

Is there much of a difference between flatland and park/street frames?

I am a newbie at biking, and I've been wanting to get into BMX for a few years, and I can now since I actually have some money. Primarily I've been wanting a 20" BMX bike with front and rear brakes ...
3
votes
1answer
211 views

How to find a frame given a geometry

In 2007, I bought my first bike: a Bianchi Boardwalk 2006. It was a great bike, but I didn't treat it well and it now needs about $300 worth of work. I've been thinking that maybe I'd like to take ...
2
votes
2answers
713 views

Bike fitting experiences

I just recently went through a Specialized BG Pro-Fit (was about $200), and have to say that I'm super happy with the results and experience. The fitter was telling me about some others out there ...
2
votes
2answers
347 views

Are flat handlebars stable at high speed?

I live in a mountainous area, and so there are lots of opportunities for descending at high speed. I currently have a bike with drop bars, and when in the drops, I feel very stable doing this. I am ...
2
votes
1answer
775 views

Geometry between 50mm stem and a 65mm stem and riding experience

Will I notice much difference beside just having a slightly longer cockpit between my seat and fork if I upgrade from a 50mm to a 65 mm stem? is this 15mm a significant enough adjustment to make my ...
2
votes
1answer
191 views

Bicycle Geometry 101?

Are there any resources or books that discuss bicycle geometry? I am looking for resources that would allow to get a rough idea of how relaxed or aggressive a particular bicycle geometry is, by ...
1
vote
4answers
305 views

Why don't race bikes have solid front triangles?

I know that cutting material out makes a bike lighter, but at some point there must be a crossover between weight and aerodynamics. Since tri-bikes and track bikes have more oval/flat shaped tubes, ...
1
vote
2answers
137 views

Can a 120mm fork be mounted on Specialized Myka?

I have this fork available: RST Gila T8 (120mm travel option). The 80mm XCT fork on a 2-year old Specialized Myka is getting worn. I am considering installing the fork. Here it is explained that ...
1
vote
3answers
524 views

If I replaced the fork on my cyclocross bike with a track fork, what would be the effect on the bike geometry?

If I replaced the fork on my cyclocross bike, surly cross check, with a track fork, what would be the effect on the bike geometry? What would be the effect of the modified geometry on bike handling. ...
1
vote
1answer
354 views

What should I look for in a mountain bike for doing BMX-style balancing tricks?

When I was a kid I started learning to ride around on my back wheel and it was really difficult. Then I tried doing it on a crappy CCM mountain bike we had (rather than my nice Gary Fisher Piranha) ...
1
vote
1answer
281 views

Low Top Tube Xtracycle Donor Frame?

One of my most useful bicycles is my 58cm 700c Xtracycle based on a Novara Xpresso cyclocross style frame. Lately, as the kids are getting bigger and my back isn't getting any younger: I crave a much ...
0
votes
2answers
414 views

Lower vs. Taller Bottom Bracket Height

The bottom bracket height on some bikes can be adjusted 7.0mm by flipping a "chip" in the shock mount linkage. This also effects head tube angle by 0.5 degrees. Theoretically speaking, What are the ...
0
votes
1answer
202 views

How does the geometry of cross bikes affect on-road handling?

I'm planning on getting a cyclocross bike for commuting because my road bike is suboptimal for riding in rain and snow. A bike shop employee told me that cross bikes have worse geometry for riding on ...
0
votes
1answer
54 views

Is the head angle on full suspension bikes given with or without sag?

Is the head angle on a full suspension mountain bike measured with our without sag? I would imagine that the rear shock sagging would give a slacker head angle than what is measured without sag.