Sure win 170 upright bike pedal tension is not enough

SOURCE: The tension adjustment does not get difficult enough

If you are refering to a regular bicycle this means the derailer is not making the chain jump from gear to gear. You probably need a new shifter cable or the shifter cable came unhooked from the derailer. I would take your bike to a bike shop to have this reconnected and then they will adjust it for you.

If you are refering to an exercise bike then here may be your solution. From what I have seen on exercise bikes there are three different kind of bikes. I am refering to how there resistance works.

First type has a strap that wraps around the wheel. There is a some kind of a nut and a bolt that holds that strap around the wheel. You simply need to tighten that nut. The strap will stretch over time and that is why you do not have the same resisteace you had when the bike was new. Afer you tighten this you will find that regular tensioner works better.

The Second type of exercise bike has what appears to be brake pads contacting the wheel. Basically your peddaling the bike with the brakes on. Pretty simple concept. Again there should be some sort of adjustment around this pad that is touching the wheel. Probably a screw or a bolt. Some even have adjusters that you can turn with your fingers.

The new and improved exercise bikes have what is called magnetic resistance. This is where your resitance is created by a magnet and some sort of power source such as batteries or your bike being plugged into a wall outlet. If you are using batteries replace them. I found that with my elyptical exerciser new batteries made a world of difference in the resistance settings. If changing the batteries doesn't help then there may be another problem. This could be the computer. Just check your user manual and I am sure you can get it replaced.

SOURCE: I have a diamondback serene citi; in the highest

The "highest" gear would be the one where the chain is on the smallest cog of the back wheel and on the largest cog by the pedals. I mention this just in case you don't actually have it in the highest gear. But if you do, then no, other than dragging the brakes, you can't increase the pedal effort. (If this is one of the bikes that automatically shifts the gears for you, then yes it would be possible by changing the weight of the flywheel - but I recommend against it.) Many adult riders who haven't been riding much for some time experience this same desire, because they expect the pedal effort to be higher. I would guess that you are expecting to get some exercise. Biking is a good choice, but it takes time to warm up to it. Using a high pedal effort too soon will injure your knees and ankles. Better to take it easy, increase the time and distance and you find that you cadence (the rpm of your pedals) will naturally increase. Check what cadence you tend to find comfortable now. A healthy cadence is about 70 rpm. But you will probably find 40 rpm more comfortable at first. Good luck, stick with it. :) (By the way, most experienced riders find that those bikes the shift automatically actually give to high of a pedal effort - they tend to target a cadence of about 50 rpm.) I hope you found this helpful and encouraging. Al K

Testimonial: "Thanks! This was vey helpful!"

SOURCE: Voltage for DM-28880E Ergometric Bike replacement power connector

I have just brought this bike off trademe. It has a 230v 50Hz o/p D6v 1000mA. check out **** Smith http://www.dicksmith.co.nz/product/M9926/international-power-adaptor-5-23v