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That is not an intentional feature and it should not be happening. Check to see if the chain is in fact moving onto a larger sprocket under braking. Find a area where you can ride safely in a straight …

Rear gears first, as that's a straightforward fix. The length of the cable between the shifter and the derailleur is too long. The cable probably pulled through the pinch bolt on the derailleur. …

Comfort oriented hybrid bikes are good for recreational riding on smooth prepared trails without steep hills. 7 speed bikes are simpler, but without a choice of front sprockets you will want to be su …

Lower ratio gears also allow riding up steep slopes that would be impossible using gear ratios that are suitable for riding on flat surfaces. … In other words, multiple gears make riding much easier for most riders. Converting a single speed bicycle to multi gear with a derailleur is usually problematic and not cost-effective. …

You get an extra gear ratio and closer spacing of ratios with 11 speeds. 10 speeds drivetrains weigh 1 sprocket less I guess, and 10 speeds chains and cassettes are cheaper too.

Looks like the left-hand front shifter has multiple positions to allow you to adjust the front derailleur to avoid chain rub when shifting through the rear sprockets. The shifter is probably corroded …

Well, if you have 8 speed shifters an 8 speed cassette those will work together. (I'm a bit confused about how you were getting this to work with a 7 speed cassette as the spacing between sprockets is …

Ignoring friction in the shift cable and housing, the force you apply to the shift lever when downshifting (inwards to a larger sprocket) has to overcome the force from the derailleur parallelogram sp …

When you replace a wheel the cassette is not guaranteed to be in exactly the same place relative to the frame as it was on the old wheel, so you need to re-adjust the limits and indexing of the derail …

It's reasonably common to have some shifting problems with derailleur systems, especially on a 25 year old bike. A common problem is friction between the shifter cables and housing due to wear and di …

Sounds like there are two problems: chain coming off the rear sprockets and bad derailleur adjustment. These two things are very likely connected. A good reference for this type of repair is the Park …

from a comment: I think shorter cranks would the widen the angle of rotation where your leg can produce decent torque. When my knee is making a right angle I feel my torque is at its lowest. I think …

If the shifter does not move the derailleur at all, then either: A cable housing has come free from the shifter unit, frame boss or derailleur A cable end has detached from the shifter A cable end …

The derailleur itself was possibly not bent. It was most likely the derailleur hanger, which is meant to bend to save the derailleur from damage. I would not use that mechanic again as he failed to s …

You have a Shimano Positron shifter and derailleur. If you didn't know you own a bit of bicycle gear shifting history. See Sheldon Browns Shimano page and look for 'Positron'. Simply googling for 'sh …