54 votes

Why do we need air-filled tires?

Is this a conspiracy of bike and wheel manufacturers, to maintain a steady demand for tubes and tires? No, because if it worked as well as you suspect, someone would have made it happen and taken all ...
whatsisname's user avatar
  • 12.1k
30 votes

Why do we need air-filled tires?

There are two good answers here already, I'll add the relevant physics. Any suspension has three key variables: Its spring constant, i.e. how quickly the force rises as the suspension is compressed. ...
cmaster - reinstate monica's user avatar
18 votes

Does the use of front suspension negatively affect road riding efficiency?

A common misconception is that riders associate suspension with comfort. The reality is that suspension is not there to make your bike more comfortable. The purpose of suspension is to allow the wheel ...
Swifty's user avatar
  • 12.8k
13 votes

Does the use of front suspension negatively affect road riding efficiency?

A couple minor points not addressed above. First, your tires provide a significant amount of suspension. I don't know how many riders inflate their tires to the maximum pressure on the sidewall. ...
Weiwen Ng's user avatar
  • 31.3k
12 votes
Accepted

Why don't we see fork boots anymore?

Fork boots were used to keep dirt off the stanchions and help keep the wipers clean. Modern quality forks have wipers that clean better and last longer, and more abrasive resistant stanchions, so no ...
mattnz's user avatar
  • 50.5k
12 votes

Why do we need air-filled tires?

We don't, and alternatives exist What we need is some level of compliance in the tyre. Rolling resistance at this level is governed by the tyre's ability to roll over small surface deviations. Air (...
Graham's user avatar
  • 1,099
11 votes

Spring frame in place of shocks?

Softride is one of the bigger names in this area. Their main bike design exchanged the top/seat tube and seat stays for a composite materials "beam" that cantilevered back to a saddle in ...
Criggie's user avatar
  • 124k
11 votes

Does the use of front suspension negatively affect road riding efficiency?

A suspension fork serves basically no purpose on the road and does very little to add to the comfort. Due to the design of most suspension forks they are excellent at absorbing large impacts, but ...
Andy P's user avatar
  • 18.3k
10 votes
Accepted

How often do you really need to service forks and shocks?

Suspension needs to be serviced in order to maintain low levels of friction, maintain proper sealing of air and oil, and clean away dirt and other foreign matter. This results in consistent and smooth ...
MaplePanda's user avatar
  • 15.5k
10 votes
Accepted

Why do coil suspension forks have coils placed inside the stanchions, when the rear shocks place it exernally?

Attributes of telescopic forks: A fork is a structural part that takes all of the front wheel’s loads. Its stiffness is greatly linked to its stanchion diameter. (Second moment of area vs stiffness ...
MaplePanda's user avatar
  • 15.5k
9 votes

What year is specialized stumpjumper sold? What rear shock does it have?

You don't have a Stumpjumper, you have a 2002 Epic FSR and the shock built specially for Specialized features 'Brain' technology. This is quite a special bike since we see the introduction of the ...
Andy P's user avatar
  • 18.3k
8 votes

Fiido D2: shock absorber broken

Your best bet would be to contact the manufacturer for specifications or even replacement parts. Failing that, your next best thing should be to measure/learn parameters of your current shock, and ...
Grigory Rechistov's user avatar
8 votes

Does the use of front suspension negatively affect road riding efficiency?

I ride my MTB on the road a fair bit, as I ride to trails etc. in preference to driving. I also recently did a day with about 140km of road on my MTB (a Saracen hardtail, entry level) to get to 60km ...
Chris H's user avatar
  • 58.9k
7 votes
Accepted

What are the effects of different types of rear shock installation on full-suspension bikes?

The good folks at Bike Radar have already covered this in pretty good detail in a two part article: Part 1 and Part 2 There's also a chunky thread on the Pinkbike forums that has pictures and ...
Andy P's user avatar
  • 18.3k
7 votes

Do kits that allow me to add lockout to my shock exist?

Lockouts are performed internally within the shock, often by closing out part of the dampener circuit. This would make it nearly impossible to create a general upgrade kit as shocks can have very ...
Rider_X's user avatar
  • 30.6k
7 votes

Spring frame in place of shocks?

The reason why flexible forks and stays are not used for suspension is geometry. With flexible forks blades or stays there is nothing that makes the left and right side of the fork flex together. ...
ojs's user avatar
  • 22k
7 votes

Why do we need air-filled tires?

A wheel is essentially round, a road is essentially flat. For reasonable contact with the road that does not damage either wheel or road, the tire needs to be deformed at the contact point to make a ...
user56703's user avatar
6 votes
Accepted

How to mount Ohlins TTX22M to a 2018 Yeti SB 5.5

Here's the debacle of how I mounted an Ohlins shock to a Yeti SB 5.5. There is practically no information on the internet explaining how to do this; therefore, I wrote my experience to give back to ...
Kellen Stuart's user avatar
6 votes

Spring frame in place of shocks?

Too much "spring" is not always a good thing, especially when it allows the frame to flex in directions it is not supposed to. There is a video by Colin Furze where he makes several attempts ...
Grigory Rechistov's user avatar
6 votes

Why do we need air-filled tires?

This is one of those ideas that comes around every couple of years, over and over. And it is quite plausibly a good idea in certain circumstances, like your martian rover (AA doesn't service there), ...
Criggie's user avatar
  • 124k
6 votes
Accepted

Wear-based maintenance/overhaul of air spring suspension fork

For starters, I think it's unfair to make a comparison with chains. Your chain is a fairly cheap part that is designed to be replaced frequently. Unless your wallet is overflowing, suspension is ...
MaplePanda's user avatar
  • 15.5k
5 votes
Accepted

How does this front shock design work?

My understanding is that a car has two systems - the springs (leaf or coils) and the shocks/shock absorbers. Springs absorb the initial impact, but springs alone would be bouncy. So Shocks (should ...
Criggie's user avatar
  • 124k
5 votes
Accepted

Do these shocks look okay?

looks normal to me. There is oil in the bottom of the fork that lubricates the fork stanchions during use. There are rubber seals that hold the oil in the bottom of the fork, but they are not going to ...
el_oso's user avatar
  • 734
5 votes

Do suspension seatposts work as well as a full suspension MTB?

Suspension seat posts and full suspension have different jobs and can't be compared. The primary goal of a suspension seat post is to provide rider comfort. The primary goal of bicycle suspension is ...
Andy P's user avatar
  • 18.3k
5 votes

How often do you really need to service forks and shocks?

My guess is most shocks get neglected till they are stuffed, often resulting in the need to buy new ones or writing off the bike. A basic service can be done yourself and costs a bit of time. It costs ...
mattnz's user avatar
  • 50.5k
5 votes

What year is specialized stumpjumper sold? What rear shock does it have?

When I have been confronted with older Specialized Brain components before, I have followed the trail up by speaking to Specialized warranty department to see who does the warranty service in your ...
Noise's user avatar
  • 13.9k
4 votes

What are the effects of different types of rear shock installation on full-suspension bikes?

I would say that the position of the shock doesn't really matter. What matter is : The path of the wheel axis The shock dynamic (How the shock is compressed regarding the position of wheel) 1) The ...
bokan's user avatar
  • 231
4 votes

Damaged in a crash

Have you given your bike an M check over? https://www.sustrans.org.uk/sites/default/files/images/files/migrated-pdfs/frk_bikemcheck.pdf Do it in a well lit area when you're not rushed. As long ...
Criggie's user avatar
  • 124k
4 votes

Spring frame in place of shocks?

Specialized frames around 2010 used to have “Zertz” inserts “for a compliant, but super responsive” experience. Look at the seat stay, seat post and front fork: I think now they are instead using ...
Michael's user avatar
  • 27.4k
4 votes

Spring frame in place of shocks?

The hard part is that you don't just want a flexible frame and springy-ness. All bike frames do incorporate some level of flex. As soon as any structure is loaded, it deflects. In Engineering terms: ...
Apfelsaft's user avatar
  • 461

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