No. Front derailers had to match the seat tube diameter and the pull direction, for rear derailers there's a 3-way match between the cable pull of the shifter, the throw of the derailer and the spacing of the rear sprockets.
When choosing a derailleur bike for off-road cycling, key features to consider include the type of terrain you'll be riding on, the number of gears, the quality of the derailleur system, the durability of the bike frame, the suspension system, and the overall fit and comfort of the bike for your body size and riding style.
Cruisers are usually single-speeds, but can be fitted with either internal gear hubs or derailer gear hubs. Usually 3-5 speed IGHs or 6-7 speeds derailer gears.
On a MTB it's usually a clamp that goes around the seat post. On a road bike it can also be screwed on to a soldered tab on the frame.
No.
You need to visit any mechanic, to fit in ur bike.
Any tyre that will fit the rim and clear the frame.
Cap-Barbell-Omega-Magnetic-Upright-Bike is a perfectly adjustable model and it can fit or adjust to persons of any heights.
Well, first off the derailer usually haven't got any gears, it's just a lever that can move a certain distance sideways when something happens with the shifter. Secondly, that sounds like an adjustment issue. Either it's the limit screw for the RDs travel that needs backing out a couple of turns, or it's a cable length issue. Since I don't know if you mean the biggest or the smallest sprocket when you say "first gear" I can't provide any more specific help. I suggest you go to www.parktool.com, www.bicycletutor.com or www.sheldongbrown.com to read up on how to fix your bike.
Sure you can. But it won't gain you that much, as you will need either to keep the rear derailer or to install a special device to keep the chain tensioned.
First gear on a bicycle with external/derailer gears is with the chain on the smallest chainwheel(by the pedals) and the biggest sprocket(by the rear wheel).
To fix a bike derailleur that is not shifting properly, you can try adjusting the cable tension, checking the derailleur alignment, and ensuring the limit screws are set correctly. If these steps do not solve the issue, it may be necessary to replace the derailleur or seek assistance from a professional bike mechanic.
the fit co bike is the best