There are patches that don’t require vulcanizer—the infamous peel-and-stick. One brand, the Park Tool GP-2, has some genuinely enthusiastic endorsements, so we tested it. I applied Park Tool patches to four different tires, at three different psi levels (60, 90, and 120). Three of the four didn’t hold—two released within minutes. The fourth deflated overnight. I redid the test, but repeated a second time, they all leaked within a day.
2) On my second day, the pannier bag fell off and got lost after I stopped for lunch, which required locking up the bike somewhere, so I took the bag into restaurant and re-attached it using the two velcro straps on the rear rack. I've used many panniers before, thought I did it correctly. But apparently I did not. So I paid $55 (cost) to replace everything in bag and bag. In hindsight, I wished I'd put a bungee around bag straps to really secure it to bike. PROBABLY MY FAULT.
Good bike repair stand. I can't say "great," because it arrived with some small plastic pieces broken. These are small pieces that go between the legs and the supports for the legs to act as a sort of buffer to prevent metal to metal scraping. They are just too fragile, it seems. 3 out of 4 legs had these broken upon arrival. However, these are really only "nice" to haves, not need to haves, and they don't really detract from using the stand in any way. Once you have the stand set up, you don't worry about these at all. The main clamp holds the bike well, if you take care to balance the bike properly. The bike may tilt in the stand if you don't balance it - there is a weight limit to the clamp. I like the included tool tray, but I wish it was more adjustable in height (it is essentially fixed in one position). And the tray could be larger. Otherwise, I am quite happy with this stand. I have worked on several bikes using it, and assembled one out of the box. It makes the job of doing things like adjusting brakes and indexing derailleurs so much easier. The price of this stand is excellent considering the quality.
It is a good solid stand made mostly from heavy metal, but it does have a couple of problems. (I will use part names from the instructions to explain.) First, the clamp between the "telescopic bar" and the "upright" is plastic. It arrived broken in the box. Whoever boxed it should understand that if you put it in the box broken, the customer will remove it from the box broken. I did not return it as broken because I was able to Gorilla Glue it back together and it works fine; it clamps tight enough to hold the telescopic bar in place. Second, the "bike support stand" (the horizontal bar at the top that holds the bike), when attached to the seat support does not grip tight enough to hold the bike in the position I set because there is too much weight from the front of the bike. The torque causes the bike to rotate until the front wheel is on the ground. That is not enough for me to return the stand because I seldom work on the front wheel and if I do I can attach the stand to the top horizontal of the bike frame. I think they could fix the problem by not making the "bike support stand" so smooth, give that part a sandpaper like finish or put rubber fingers inside the clamp so the part does not slip under the torque from the weight of the front of the bike. I might rough up the stand part with sandpaper, or put small grooves in it to give the clamp something to grip on to see if that solves the problem. Third, the clamp holding the bike frame even at full tight will not keep the bike from rotating around the frame. It is not enough for me to send the stand back, just a minor annoyance. The problem is there is smooth plastic trying to clamp a smooth metal frame. I think they could fix this by putting thin rubber pads in the clamp. I will probably run out and get some pads to try that out. I think it is a good stand for the price. The stand itself is made from much heavier metal than I expected. It is very stable with the four legs. I easily overcame all the issues so I kept it.
It’s both surprising, and not, if you think about it. The way I’ve usually seen it happen is first the rear tire goes flat, then the front one. My theory is that both tires went through the same pile of glass/thorns/metal bits and they both picked up junk. the reason for the flat occurring on the back first is because there’s more weight on that tire, so the offending article works its way through the tread more quickly.
Patch kit: Patch kits are easy to use, light and compact, and if you get more than one flat on a ride (it happens more than you’d expect), it can save you when you’ve already used your spare tube. Plus, on a rear wheel, patching a tube can be faster than replacing it, as you can often do this without removing the wheel at all. Another upcoming post is going to show you how to patch a tube.
Modern bottom brackets use a sealed bearing type construction that keeps water and debris locked out, so they seldom go wrong. Maintenance is impossible so they need replacing when they do wear out. Older style cup bottom brackets need to be re-greased every now and again, and occasionally will need to have their bearings replaced. There are a lot more teeth on the chainring cogs than those on the rear cassette, so need changing less regularly. Cranks usually a solid one piece construction so there is not much to go wrong.