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most bicycles have saddles with standard ~1/4" diameter rails that can be interchanged on any bike. Caveat emptor: I do remember seeing some Huffy bikes back in the '80's and '90's that had flat vertical blade like rails that were only used by Huffy. If that is the case you can always get a new seat post (make sure you get the right diameter to fit in the seat tube, it's stamped on the seat post near the bottom) and a new saddle that will work with the seat post. Any local bike shop can help you get the right size and fit that you need. ($15+ for a seat post, $30+ for a saddle).
The rear derailleur needs to be adjusted to stop this from happening. Put the bike in third gear and flip it over onto the seat. Spin the wheels and turn the adjuster until it starts to try and shift into 2nd, then back it off a couple of clicks. Problem solved.
A typical seat post will have a tapered end that slips into the seat clamp which grips the post and clamps the seat rails, all at the same time. If the seat post is not tapered at one end, then it must be a 22.2mm post. Loosen the seat clamp's nuts enough to install the saddle rails. The clamping area for the post should be under the "nose" of the seat. It should loosen enough to slip over the post without falling apart. Otherwise, you may have mis-matched parts.
You will have to buy a seatpost, either pivotal or railed depending on your seat. A railed seat has two rails underneath it, and needs a railed seatpost. A pivotal seat has a prism with teeth cut into it on the bottom, and requires a pivotal seatpost.
The manual lever to release the seat is supposed to have a spring on it to return the release lever to the lock position, if the lever does not spring back when you let go of the seat adjustment lever then you know there is a missing, dis-connected, or broken return spring.
If this is the case try putting the seat where you want it to be and make sure that the adjustment lever returns to the lock position, now check to see if the seat will lock in with the adjustment lever in the lock position.
If it does lock in repair or replace the return spring.
Make sure that the adjustment lever is attached to the locking linkage and it does move the locking mechanism.
If it still does not lock into place then there is something wrong with the seat locking mechanism, and some WD-40 sprayed onto the seat rails and track might release a stuck mechanism, and if everything seems to be working alright, and you can see that the locking mechanism in the seat rail is moving in and out of the lock position, then the locking tabs are most likely sheered off and you will need to replace the seat.
Also look under the drivers side seat and compare the lever position and the linkage connections with the passenger side seat, and make sure that it is all operating like the drivers side seat.
The lube you want is bicycle chain oil. Nothing else is acceptable. Any brand is fine, only make sure you use a bicycle-specific chain oil. Only lubricate the chain, never the derailleurs. And it is best to scrub your chain prior to lubing by using a good chain brush and a degreaser.
The seat is lowered by either a quick-release collar or a standard screw-type collar. The former reuires no tools, but the latter will require an allen wrench. If you need to use a tool to do it, bicycles are 99.9% metric. When adjusting, you want to be comfortable, but you also want to maximize pedaling power by adjusting the seat to a height that puts you where the end of your down-stroke ends where your leg is only slightly bent.
ok, first take tube and tire off rime completely....Place the tube inside the tire with just enough pressure in the tube to hold it in place (first this will eliminate any possibility of pinching the tube and will allow it to seat properly and second it will add counter pressure to help get the tire seated. Start by sliding one side of the tire onto the rim. lining up the valve stem with the hole in the rim. Then either use rim tools (best idea and they are cheap) or your hands (never use metel tools) start working the other side on starting both hands in one spot and moving each hand away from each other until they meet up again at the other side. But my best advise it to get 2 rim tools, $3.00 a piece as you can use them to lip up under the tire and pull it up and over the rim. Make the job much easier. and you can literally put a tire on in under 2 minutes.
If you are looking for instructions on how to mount the seat onto your seat post, it is a straightforward, easy install. If you are asking how to actually use the seat, that is also very easy to explain. Can you please clarify what you specifically need instructions for. Bicycle seats do not usually come with instructions, as one can see how to install a seat by simply removing the old seat. If you use an adjustable wrench, or alternately an open ended wrench to remove the existing seat, you can easily install the new seat yourself. Be sure to firmly tighten the rail clamps underneath the seat (using the bolt that is inserted through the u-shaped seat post clamp) so there is no shifting of the seat while riding. If you need additional information, please write back.
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