Why does my back wheel wobble on my bike?

If it's wobbling side to side, there are two problems that are possible; Your cup-and-cone bearings could be loose or your wheel could be out of true (slightly buckled.) Take your wheel off and hold the axle. Wobble it up and down a few times. Worst case scenario, you could be looking at missing spokes or a bent axle.

Correspondingly, is it safe to ride a bike with a wobbly wheel?

If you have the slightest doubt then you can ride the bike using the other brake as your primary, using the brake on the affected wheel for 'emergencies only'. Untrue wheels are weaker, may cause steering to be difficult at high speed, and if you're using rim brakes it will cause stuttering or lockups.

Furthermore, why does my bike tire keep going flat? – The valve is another area that can commonly cause a flat tire. Then, replace the tire edges inside the rim. You can also slightly push the valve back up into the tire, then inflate the tube fully. This will allow the tire to sit evenly and correctly, avoiding bulges in the tire that can lead to punctures.

Furthermore, can you straighten a bike rim?

With the bike upside-down or mounted to a stand, spin the wheel, then hold the marker against the fork near the rim, and slowly move it closer to the rim until the marker just touches the rim as the bent part passes it. After you adjust the spokes, wipe the rim clean and repeat the process until the rim is straight.

Why do bike tires go flat when not in use?

If the pressure reduces, the seal between the tyre and the rim is less efficient, and so more air escapes, and as this happens, the seal becomes ever more ineffective, so creating a downward spiral.

How do I know if my bike tire needs air?

Most every bike tire lists its recommended pressure right on the edge of the tire's sidewall. It's usually a range, say from 35 to 80 psi (that stands for “pounds per square inch”). The only way to know how much pressure you have is by using a pressure gauge — squeezing your tire isn't accurate enough.

How much does a bike tube cost?

Flat tire: New inner tube installed for $25 and up, including new tube. $17 if your wheel is already off the bike. Specialty tubes (extra long valves, odd sizes, thorn proof, etc.), or bikes with internally geared hubs or full chain cases incur higher costs due to repair complexity or component rarity.

How often should I true my wheels?

I true wheels when they need it - usually about once or twice a year. Get yourself a spoke wrench and a truing stand. It's not all that hard, just takes time and patience. At the bare minimum you should have a wrench in case you need to tweak a wheel out on a ride.

How often should I tighten my spokes?

If your wheels were built well, once a year or less take it into the shop and get a touch up. If you do mess with your wheels it is just as important to loosen the opposite side spokes as you tighten one side to cure a hop. Sometimes if only one spoke is loose you don't need to loosen others.

How true does a bike wheel need to be?

Truing By Pitch The wheel does not have to be perfectly round or true; slight runouts are acceptable (a few millimeters). As long as there are no loose spokes and the wheel is reasonably straight (the rim and tire mustn't rub on the brake pads), it will ride nicely and hold up fine.

Is wheel wobble dangerous?

It's worth learning from the experience that however benign a euphemism such as 'Wheel-wobble' may sound, untreated, it can still kill you.

How can you tell if rims are good?

How to Tell if a Car Rim Is Bent?

Remove the rim from the tire. If the damage isn't obvious while the rim is on the tire, take a closer look.
Examine both lips of the rim. Look for dents, warps, indentations or bends in the outside and the inside lips.
Lay the rim down on a flat surface.

Why do spokes come loose?

For the spokes to loosen, the load would have to deform the rim enough to relieve the spoke of all tension so that the nipple can turn. If the spokes are this loose they would readily flex sideways if you pressed on them.

How do I know if my bike bearings are bad?

Hold onto and turn the axle because it's holding the parts in contact with the bearings. Hub bearings in good condition will feel smooth when you turn the axle because the grease inside is coating the bearings preventing metal-on-metal contact. Worn out or dry bearings will feel rough, metallic and dry.

How do I fix the rear hub on my bike?

Hub Adjustment - Cartridge Bearing Hubs

Mount bike in repair stand.
Remove rear wheel from bike. If adjusting front wheel, remove front wheel as well.
Remove quick release skewer and springs. Remove any rubber boot covering left side cones and locknuts.
Insert skewer through cog side of hub.

How do you adjust bearings?

To remove, lever up the tab with a screwdriver. Use a new tab washer when you refit. Tighten the inner nut to give the correct amount of play - just enough to let the wheel rotate freely - then bend down the tab. Tighten the other nut hard against it, and bend up the other tab to lock both securely.

Can you tighten wheel bearings?

Once greased up and put back into place, wheel bearings need to be tightened in a very specific way. However, if the bearing is not tightened enough, the bearing will loosen itself up and the entire wheel may fall off. Needless to say, tightening a wheel bearing has to be done carefully and precisely.