Bicycles Stack Exchange
Bicycles Stack Exchange

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1500 questions
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11 answers

Which puncture-resistant tires?

I commute on city streets and have had two punctures in 5 months: first a roofing nail, second a small shard of glass. Punctures are a nuisance. I've read some people recommend Schwalbe "Marathon" tires. A comment in reply to Are slick tires worth…
ChrisW
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Cost of lending out a child's bike?

My son's elementary school teaches kids to ride a bike in gym class. Basically, they adjust the schedule so the 2nd grade kids (7-8 year olds) have extra gym classes during a 1 month period and during these classes the kids are taught to ride. The…
StrongBad
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5 answers

Fix up old road bike or buy new one?

Coming back to riding after a long layoff, my Cannondale R500, purchased around 2000, according to the local bike shop, needs a lot of work - new wheels, cassette, chain, cables. Also replaced stem with a new taller one so I don't have to bend down…
Steve
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3 answers

What makes a comfortable wheel?

I rode about 5000Km on Mavic Ksyrium Elite Wheels and changed them for inexpensive Prime race wheels. The difference in ride comfort is huge. The Mavic wheels provide a very harsh ride. The prime wheels are very smooth. I use the exact same tires…
The Bartman
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3 answers

How do I calculate the diameter of a chainring from the number of teeth?

Simply knowing the number of teeth on a chainring can we determine an accurate diameter?
Dog Ears
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2 answers

Feasibility of bike frame design by a layperson

I'm sure for many bike builders, their ultimate dream bike starts with a frame that they designed themselves. And herein lies the problem: it seems that modern means of frame production (e.g., hydroforming) implies very sophisticated shapes of…
Dmitri Nesteruk
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15 answers

What's the best way to track your performance?

I was checking some options to track my performance (kms/hr, distance, altitude, etc...), I do MTB and city biking. The first choice is a nokia based tracker (http://www.sports-tracker.com/), I love nokia phones. Various choices come from this…
Mahomedalid
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6 answers

Do bike frames actually break so easily?

I've been thinking of getting an MTB. Watching all those videos on YouTube of people doing cool stunts or even just riding in a forest off-road looks amazing - until I got to videos like this one: I've seen lots of posts on how to prevent…
Nick
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Why do front and rear wheel hubs have different sized ball bearings?

Conventional front wheel cup and cone bearings have 10x 3/16" ball bearings per side, whereas the rear wheel has 9x 1/4" ball bearings per side. Manufacturers have been on a continuous quest over time, to simplify bikes in terms of ease of…
Criggie
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4 answers

Can you ride a bicycle at 90 km/h on a flat road?

This video was featured in a leading news website in my country. It's a cyclist riding on a highway with very high velocity - said to be 90 km/h - close behind a truck. The road is flat, so it keeps puzzling me: how could he reach and maintain such…
Neinstein
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Why would a salty damp road be slipperier than the same road just damp?

I came off this morning* on a road I ride every day, in all weather conditions. Last night was frosty so the road was salted/gritted, but there was no visible frost nearby, it had warmed up from the overnight minimum, and the road is quite heavily…
Chris H
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7 answers

How to prevent Alfine 8 from "skipping"/"slipping under load?

I bought a nice belt-drive bike with an Alfine 8 hub. While I love everything about the belt, the Alfine hub gives me grief: under high(er) torque - think fast acceleration from a stop at a light - it skips/slips for about half a rotation and makes…
SebastianR
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Why replace brake cartridge when grooves wear off

Many websites recommend replacing rim brake cartridges (pads) when the grooves on them have worn off. Why would this be reasonable, other than for the hypothetical reasons listed below? I am looking for a scientific/engineering perspective, not…
Sander Heinsalu
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10 answers

Is 17 miles (27km) each way a lot for a newbie cyclist?

I go to the gym on a regular basis and do a fair bit of running. I feel like I'm fit enough to do this. It would be a one-off ride from Wembley to Slough and back so it would be a fair bit of road which could be a problem.
Ryan Thompson
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How close to the kerb should I cycle?

I'm new here, and also pretty new to cycling as my main form of travel. Note that I'm from the UK, so we drive on the left. I always ride on the lane closest to the kerb. On one of my journeys I have to go over a dual carriageway, and I noticed that…
mrnovice
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