Construction wise, they are not much different from each other. Both of them contains male and female part and a mechanism inside it to do it's role. In telescopic setup, the female part is in down side and the male part is in the top. If you invert them, you'll get a USD fork. Inside the fork there are several components like spring, shims, valves and more importantly a fork oil and it's seal. Fork gaiter is a additional accessory where fork oil seal leak is prevented by them.
The spring inside a fork should allow the wheel to move from bottom to top freely according to the road conditions. Two important action takes place inside a fork. When the tyre hit a bump or anything, the spring compresses and it is termed as compression damping and it should come to the orginal position. It is termed as rebound damping. You may have noticed in a old buses where, after crossing a speed breaker, the body continue to move upside down. It's because of of the good spring action and bad dampers.
The main reason why USD'd were developed is structural rigidity. The female part of the fork is thick compared to the male part. In USD's, the female part is in the top portion followed by the male part in down providing more structural strength. Generally, a triple tree or triple clamp is mounted in the steering head of the frame. The upper and lower triple clamps need a more area to hold on for more structural strength. As engine power increases, more structural strength is required and that's why the reason manufacturers opt for USD. But that doesn't mean USD's are always better than conventional telescopics.
Generally, manufacturers select the type of fork for their bike based on several factors such as cost, engine power, frame design etc.. We can still see some manufacturers using conventional telescopic in their bikes. They know what will suit for their bikes and which is more effective, efficient and cost effective. As said previously, they install it after considering several factors like overall power, design etc.
In a offroad bike, you'll need a long travel action and more structural rigidity when you slide, jump, etc.. That's why they opt for USD. Also in the race bikes, while doing cornerings, enormous amount of force will be acting in the frame. For withstanding all the force produced, you'll need high structural rigidity and that's why you need a USD. But when you ride a smaller CC motorbikes for daily commuting purposes, you won't need a USD. The manufacturer will select the right type of fork according to the use, need, power.
By seeing a brochure, any one can say fuel injection is better than carburettors, liquid cooling is better than oil and air cooling, USD's are better than conventional telescopics. But, in real world scenario, it's simply not like that. Manufacturers are feeding the bike with what it need and by considering several other factors. You can't just say this is better than that because of advancement.
In USD's, the fork oil remains in the top position whereas in the telescopic, it remains bottom due to the action of gravity. In USD's, the fork oil will try to go down always. When you hit any bump hard, there might be chances for the oil leakage and chance for the damage of oil seal. The suspension will do it's job in the case of oil seal leak, but the efficiency will be drastically down. That's why in off road and in adventure bikes, the front fenders extends all the way down along the fork thereby protecting it from external hits.
At the end, high performance machines need a USD fork for more rigidity and stability. After considering all the factors, manufacturers give us their best to us. We just can't say one is always better than the other one.
The spring inside a fork should allow the wheel to move from bottom to top freely according to the road conditions. Two important action takes place inside a fork. When the tyre hit a bump or anything, the spring compresses and it is termed as compression damping and it should come to the orginal position. It is termed as rebound damping. You may have noticed in a old buses where, after crossing a speed breaker, the body continue to move upside down. It's because of of the good spring action and bad dampers.
The main reason why USD'd were developed is structural rigidity. The female part of the fork is thick compared to the male part. In USD's, the female part is in the top portion followed by the male part in down providing more structural strength. Generally, a triple tree or triple clamp is mounted in the steering head of the frame. The upper and lower triple clamps need a more area to hold on for more structural strength. As engine power increases, more structural strength is required and that's why the reason manufacturers opt for USD. But that doesn't mean USD's are always better than conventional telescopics.
Generally, manufacturers select the type of fork for their bike based on several factors such as cost, engine power, frame design etc.. We can still see some manufacturers using conventional telescopic in their bikes. They know what will suit for their bikes and which is more effective, efficient and cost effective. As said previously, they install it after considering several factors like overall power, design etc.
In a offroad bike, you'll need a long travel action and more structural rigidity when you slide, jump, etc.. That's why they opt for USD. Also in the race bikes, while doing cornerings, enormous amount of force will be acting in the frame. For withstanding all the force produced, you'll need high structural rigidity and that's why you need a USD. But when you ride a smaller CC motorbikes for daily commuting purposes, you won't need a USD. The manufacturer will select the right type of fork according to the use, need, power.
By seeing a brochure, any one can say fuel injection is better than carburettors, liquid cooling is better than oil and air cooling, USD's are better than conventional telescopics. But, in real world scenario, it's simply not like that. Manufacturers are feeding the bike with what it need and by considering several other factors. You can't just say this is better than that because of advancement.
In USD's, the fork oil remains in the top position whereas in the telescopic, it remains bottom due to the action of gravity. In USD's, the fork oil will try to go down always. When you hit any bump hard, there might be chances for the oil leakage and chance for the damage of oil seal. The suspension will do it's job in the case of oil seal leak, but the efficiency will be drastically down. That's why in off road and in adventure bikes, the front fenders extends all the way down along the fork thereby protecting it from external hits.
At the end, high performance machines need a USD fork for more rigidity and stability. After considering all the factors, manufacturers give us their best to us. We just can't say one is always better than the other one.
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