Hot answers tagged

27

All the elite riders I have encountered just know. I think its part of the attention to detail necessary at that level. You almost never see them looking down to check (that would be showing a weakness and giving oponents an opportunity). But if you mean can the rider say which cog they are using at the front and rear? then the answer is that often we can'...


21

Cadence mostly. The answer to your question is in the title. Experience. Same way motocross riders know what gear they are in. The speed of the engine vs how fast they are moving.


19

Downtube shifters will really get you in touch with your bike--more than with many other shifting systems, I believe that I can actually FEEL the rear derailleur moving in my hand when I use them. Needless to say, I ride a lot of old road bikes. You will quickly gain the control to shift either from various hand positions on your road bars. Assuming ...


14

Unfortunately you cannot do that. The COGSET and the SHIFTER must have the same "distance", or more correctly, the same lateral distance (on the pulley) for each lenght of cable pulled (on the shifter). When you go from 7 to 8 speed, the distance between cogs is the same (because the freehub shell is longer), so you could use a 7 shifter with an 8 cogset ...


12

There's nothing wrong with doing this. It works well to shift the rear 1 or 2 shorter when shifting the front 1 taller (and vice versa) to avoid big steps in gearing.


11

There is no 'conspiracy' to keep friction shifters off the market just so that you have to buy the index shifters. It is simply a matter of supply and demand. Nobody in the OEM market wants friction shift gears because bikes with friction-shift simply do not sell. That leaves the after-market and you have a similar position there - the demand does not exist ...


11

The simple answer is, no, it is not advisable, and yes it can cause damage. The chain uses tension to shift. Shifting with both front and rear derailleurs at the same time will remove that tension. The answer above is absolutely correct, but they are a bit too phlegmatic about the risks involved. Drop a chain due to poor shifting habits, and you risk ...


11

20,000km's in 2 years on Ultegra Di2. It performs very well. Shifts are smooth, crisp, quick and effortless. I have a few other road bikes running various mechanical shifters, but have preferred the electronic shifters during the past two years. No need for adjustment due to no more cable stretch. The front derailleur auto trims and follows the rear ...


9

Depending on the tension of the chain, you might be slightly more likely to jump, e.g. going from big to little on both front and back at the same time is increasing the slack in the chain and moving it in both directions (front to the left, back to the right). So depending on the timing, not only will the slack need to be damped out and the indexing might ...


9

With friction shifters this is usually caused by one of two problems: Loose Shifter Screw: Friction shift levers usually have a wing-nut-screew used to adjust the tension and friction of the lever against the mounting housing. Tighten this screw, but not too tight or else you can't move the shift lever. You can also take the shifter apart (noting ...


9

No. The full gearing ratio of the bike (from your foot to the tire contact patch) is determined by four factors: the crank length, the chainring diameter, the cog diameter and the wheel diameter. Since these components can be changed independently, it is impossible to develop a uniform numbering system for a single component ("uniform" in this case means ...


9

The parts that Blam refers to are known as the pawls and the ratchet. Slipping can happen for a number of reasons, including warn ratchet, warn pawls, weak springs, or excessive accumulation of grease & grime within the freehub. http://dirtmountainbike.com/features/work-freehub-body.html has a thorough explanation of the different freehub types. ...


9

One of my bikes has no indicators and I'm less familiar with it than my other bike which has indicators and more years especially at the top. But I don't find it to be a problem. You don't need to know exactly which gear you're in, just enough to know (e.g) that if you want to drop a gear you need to drop a chainring. A combination of feel and a vague ...


7

I think Shimano integrated shifters ("brifters") for the front derailleur on a triple normally have 5 indexed positions: 1-3-5 are the main positions that match the chainrings and 2-4 are intermediate spots to avoid chain rub for some chainring+sprocket combinations. If you give the front shift lever a short pull it will click once and the front derailleur ...


7

Neil is right, most all "auto shifting" or "ghost shifting" is the result of cable-tension problems. If the cable is a bit loose, the derailleur will try to shift "up" to a smaller cog. If too tight, it will try to catch the next larger cog. Cables stretch, especially after a short period where the new cables stretch to the point they're stable. after that,...


7

I would try to avoid rim brakes for a low-maintenance commuter bike, because they're not low maintenance. And they don't work very well in the rain. They're also not much cheaper than cheap disk brakes. It's not worth the price difference. In my experience the roller brakes are less effective than disks or drums. The roller brakes don't bite, they're very ...


7

The typical way of using a Shimano IGH with a dropbar is using a device called a Hubbub. It is essentially a little handlebar that plugs into the right hand side of the drops and gives you a mount for the usual twist shifter which comes with the IGH (This is what I would recommend). Another alternative is mounting it on the center of the bar with an extender ...


7

I-spec is a Shimano-proprietary mounting system for Shimano parts. Its supposed to make mounting and adjusting brake+shift levers faster and easier by putting them on one mounting clamp. I couldn't find a blurb on what it does / how it operates on the Shimano website, but the equivalent for SRAM is SRAM Matchmaker, which from their website: "The ...


6

WD40 will work, for awhile, but in the longer term it'll work against you since it's a poor lubricant and will work to prevent future lubing. Spraying some penetrating oil into the ratcheting mechanism is the way to go, long and short term. Gaining access by working the brake on the shifter and spraying, using a long neck attachment for better aim, into the ...


6

No, different maker or different model with different number of "speed" shifters have different pull ratio (i.e. the length of cable pulled by a single shift). Usually it's safe to use different model with same number of gears from the same maker.


6

Having restored a number of old cheap bikes, I can tell you that the biggest problem is almost never the derailleurs/shifters. Usually these bikes have not been ridden much and have spent most of their time in a garage exposed to the elements. The biggest problems are rusted parts, poor lubrication, and horrifically bad tuning. Frequently, on a bike like ...


6

Well, I tried soaking it with WD40 and then re-lubing it with spray lithium grease. No improvement whatsoever. So I took it to the LBS, which declared it DOA. They say they've seen this before with Shimano shifters. Some internal part gets even slightly bent and the shifter fails completely. And they're not really serviceable, so that means replace it. ...


6

There was a questionnaire on Bikeforums on this topic and here you can see the results: Brifters - how reliable are they? 39 people gave their votes and obviously for most people brifters did not break at all. The second question is about working optimally. To be honest I am yet to see a brifter which does not work optimally. Brifters have very little to no ...


6

Can I use a 9 speed shifter with a 7 speed drivetrain, with good shifting and without needing complex adaptations? Kinda, maybe, sort of... its complicated You could use a Shimano 7 speed derailleur with a 9 speed shifter, if you also used a wheel with a 9 speed cog. The 7 and 9 speed Shimano derailleurs use the same derailleur ratio of 1.7 (amount of ...


5

Hehe- I'm a fossil who still uses downtube friction shifters on my 1972-vintage Euro roadster... But I do admit that as I get even yet older the allure of those nifty "brifters" is there.. Once learned, they are easy to use, forgiving of adjustment, and accommodate a wide variety of gear clusters with no problems. I took my originally 5-speed rear end up ...


5

This is based on my experience with the following type of shifters, but is limited to Shimano so others may have a different experience. I haven't tried to split out the different variations of brifters either since I've only used 105's. Integrated brake/shift levers (aka "brifters") Pros: Shifters are always close at hand, so you can always shift when ...


5

Downtube shifters can be hard to get used to. When I first used them (after having more experience with on handlebar shifters) I would feel a bit wobbly when trying to shift. It really just takes practice. If they are not indexed (click into gear) then just push the lever (up or down) until the gear changes. If there is some chain rattle, then adjust until ...


5

This is probably down to the gear cables. If the cables are new they may have stretched a little and you'll need to take the slack out by adjusting the tension, you usually do this with a barrel adjuster either at the shifter or inline in the shifter cable. If the cables have been on the bike for some time then the problem is probably sticky cables, ...


5

I don't know if you're still having this problem, but this could be useful for others, so I'll go ahead and answer it. To be honest I wouldn't bother trying to fix a gear indicator, especially a front one. It's not difficult to remember which chainring you're in and opening up the shifter is definitely going to invite problems for inexperienced mechanics. ...


5

Easiest thing to do is just cut off the old hood then take the new hood and thread it on over the bottom of the brake lever. Some are 'ergo' and have a right and left hood so make sure that you watch for right and left hoods.



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