Back On The bike

My used bike came with a 700x28 tire in front and a 700x23 tire in back. Should I leave the wider tire in front, or should I switch the tires? What benefits or drawbacks are there one way or the other? Is there any particular reason why the previous owner might have chosen non-matching tires? Is there any reason I should go out of my way to buy a new tire to make them match?

Traction is important for torque and braking. Torque is driven through back-wheel and braking on both, and braking too much in the front relative to the back can result in the rider flipping over the handle-bar.

Back On Thebike

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I assume it is common sense you should run a lower pressure in the front wheel versus the back. I weigh 175 lbs (79kg), I have tires with max 120 PSI (8.3 bar), what PSI should I run in the front and the back tire on my road bike? I use a 700x25 tire (25-622 ISO/ETRTO).

That being said, on my MTB I always run the same pressure for both tires as my main purpose is to avoid hitting the rim directly with a rock no matter if front or rear, whereas on my road bike I tend to put 10 PSI less, usually 90 for the rear and 80 on the front (Weighing around 70KG plus bike and gear).

My daughter has sparkle and glitz 12 inch bike with stabilizers (training wheels). Since we purchased the bike every now and again the back wheel keeps spinning when she is pedaling. This seems to happen more when there is a bit of an incline. Any suggestions what problem could be?

The first problem is easily fixed - the bike should lean slightly to one side or the other. When its held upright with all the weight on the back wheel, the stabilizers should be about 1-2cm off the ground (Higher for rough ground).

I regret using stabilizers on my boys bike. I now believe they hinder progress as the kids get used to them, and prevent them learning proper cornering (as the bike cannot lean). They probably cause as many crashes as they saved with my boys. If I did it again, I would buy a balance bike, (or remove the pedals and cranks) and get them balanced, then add the pedals.

Hold the rear wheel off the ground, grab the tire at the 12 o'clock and 9 o'clock (from the chain side of the bike), try to move the rim sideways. If the wheel feels like it is moving (wobbling) on the axle (other that rotating), the hub bearings are damaged or need adjusting. Your local bike repair store can tell you if they can repair the hub, or if a new wheel is required.

Hold the rear wheel off the ground, spin the wheel, watch the rim relative to the brake pads. If the rim looks like it is moving in and out relative to the pads (wobbling) as it spins, the rim is out of true. If it moves a few millimeters, it wont really affect the bike. Any more, or if the rim is hitting the brake pads, the rim needs to be trued. Again, your local bike repair store can fix that for you.

A possibility not already mentioned is a broken axle: I had the axle on my 25-year-old mountain bike break while riding and although I noticed the tire was wobbling, it wasn't until I got to my destination that I realized what had happened. The axle had snapped in the middle (inside the hub), but the bearings stayed in place becuse the seat and chainstays were essentially applying compression force to the axle. I'm sure the inside of the hub was damaged from the broken ends rubbing but I've never looked to be sure.

I just replaced a flat on my rear road-bike tire. I had also tried to replace the rear axle, By removing the axle completely, to a quick release lock but realized the axle that had been installed with the bike tire wasn't hollow so put the old axle back on the bike, seemingly correctly. This morning i went for a ride and when I put any pressure while pedaling it felt as if the rear breaks were engaged. I checked to see what would happen if i pedal with the rear tire in the air and the tire seemed fine but came to a stop more quicker than usual but nothing too alarming.

It seems the problem only occurs when im siting on the bike and there is weight. I also noticed when i pedal the rear derailleur seems to tug forward and hug the rear cog set. im not sure if that's the issue...

"Since the seats inside cycle trailers have a more or less reclined backrest, a similar criterion applies, although it depends upon the amount of side support provided by the particular design of trailer in the almost inevitable event of the passenger falling asleep."

Years of living in cities like San Francisco and New York had taught me that there was no such thing as being too paranoid when it came to bike safety. Still, despite my precautions, I tried to train myself to see my bicycles as ephemeral. "You never own a bike; you merely rent it from the bike theft gods," I told myself.

And yet I still wasn't prepared when the inevitable happened. On Sunday, February 16, at 5 p.m., my bicycle was stolen from a bike rack outside of Old Town Music on Sandy Boulevard in Portland, Oregon. As a cyclist commuter who does not own a car, I was devastated: the bike was my primary mode of transit.

When I saw the empty rack, I immediately felt depressed: I knew the probability of its safe retrieval was low. One in 10 bicycles stolen in Portland are ever recovered. Many of them are sent to chop shops, cut into constituent parts, reassembled and sold off here or elsewhere. And while I didn't want to blame myself, I did: I had spent so much time and money over the years putting anti-theft tricks, some psychological and some physics-based, on my trusty Trek road bike. These included such ridiculous measures as anti-theft stickers designed by a London artist to look like rust spots, which theoretically should deter thieves looking to make a quick buck off a nice bike.

Though the probability of return was low, I got the word out online in all the usual places to increase my odds: a Facebook page for Pacific Northwest bike theft, Craigslist lost and found, my personal social media pages. I reported the theft to the police and got a case number. On the advice of Reddit, I started scanning sites like OfferUp, Craigslist and Facebook Marketplace for a Trek bike of the same model for sale.

I figured the odds for recovery were highest on that first night. It seemed probable someone in the neighborhood had it; I rented a bikeshare bike and searched in concentric circles around the point where it was stolen, continually checking my bluetooth tracking app to see if anything had been detected. Like most non-mugging thefts, bike theft is a non-violent crime, so I figured that the thief was probably someone whose life was hard. I didn't blame them for this. I knew this wasn't personal.

Still, I was despondent. Portland in February is uncomfortably cold in a biting way that eats through your clothes. I watched a stranger start a fire in a barrel right next to a stack of half-dissembled bikes, but none were mine. It was dark and miserably cold. After circling around the neighborhood for an hour, it was time for me to go.

Halfway back to my neighborhood, about two hours after the theft occurred, I got a ping on my phone. The bike had been found! The app placed it by the Goodwill up on Broadway in North Portland, about 20 blocks north from the site where it went missing. I was far enough away at that point that it would take me a while to get back on the bus, so I called two friends who lived nearby. They agreed to pick me up and drive me around the area where it was spotted.

So we walked around the last known location for about an hour, phones out, trying to see if the bluetooth would connect to the bike. We studied the buildings in the 150-foot radius, looking for garages or locked driveway alleys. Nothing stood out.

Then on Tuesday, I had just finished work and started my commute home on the bus when all of a sudden I got another ping: the app located my bike at the corner of 10th and Oak, next to Basecamp Brewery, merely 5 blocks from where it was stolen.

The driver, Marc, picked me up, and made small talk, asked me about my day. I explained that I was on a bike rescue mission. As he drove, a second ping on the bike came through my phone, at the same location.

I didn't know exactly what to look for. At the northwest corner, there was an empty, tree-lined sidewalk; to the northeast, the solid brick wall of a large building. Walking south, I saw a white bike hanging in the window of the brewery and ran towards it, only to realize it was a Giant, not a Trek.

I only had a moment to improvise. Since the bike and my phone were now connected, I could click a button that would make the bike start beeping. But that might alarm the thieves, causing them to take off with my bike before I could get to them. They could also stick around for a confrontation. Either scenario sounded bad to me. I just wanted my bike back.

I pressed the button and the bike started beeping. If she had any doubts, I thought, this would confirm to her that the bike was mine. But judging from the look on her face, she knew I was telling the truth already. Her expression shifted from utter confusion to a smile with a hint of panic.

It is tempting to view this bike un-stealing story as a technological victory. But I don't think "get a bluetooth tracker" is the bottom line here. There are other elements that made this turn out how it did.

First, the security features. My extra-secure seatpost and the aforementioned axle locks make my bike extremely hard to chop up. It was very unlikely anyone would be able to take off the wheels and replace them or sell them separately, meaning the bike was probably going to have to be kept intact and sold as-is. It seems like that is what it was destined for when I discovered it. I suspect that it was going somewhere outside of Portland, though, as it was a distinct bike. And no bike shop would buy a bike whose wheels were impossible to remove. Hence, because of the features I'd installed, the bicycle remained intact all the way up until the moment that I found it.

But the security measures I took also contributed to a case of false confidence. I had axle locks, so I thought there was no need to lock up my bike with two locks while I was in the music store, as I used to do when I lived in New York and San Francisco. Every time you add a lock to a bike, you double the amount of time it takes to steal and increase the likelihood that a thief won't bother or will be interrupted in the act. 589ccfa754

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