New answers tagged

1

I have the same problem with Shimano GRX leaver - just found that mineral oil leaked (a spot of leaking oil is visible). bleed screw can not be screwed in (it simply scrolls in the thread). The thread exists in the port by the way. Thinking now how to fix such problem. For now I have next solutions on my mind: add mineral oil in the oil tank, put the bleed ...


1

Q1: If it not then is there a possibility to get injured? A1: Too low saddle height will usually hurt knees and it is the first element to adjust. It should be no pain or soar or any uncomfortable to go riding bicycle. And, if you feel any uncomfortable, it is then a signal to check and examine. If you feel that, you can ask your physican or post the issues ...


3

I am roughly your size (same inseam 5'8") and 52cm for a "standard" diamond frame bike would be too small for me. With a long enough stem I could get the bars in roughly the right place, but it they would likely be too low without some serious bogdery with stem riser extensions. But if you're young and flexible enough to deal with the low bar ...


0

You don't need to inflate them daily, unless using lightweight and/or latex tubes. You don't need to inflate them before every ride, unless using lightweight and/or latex tubes. A 28mm road bike tire with the heaviest 622 - 28/47 butyl inner tube you can find, inflated to 7 bar / 100 psi with air, will hold acceptable pressure for at least two weeks. By ...


0

If you are machinists you probably know about the “bouncing steel ball” material hardness test. The harder the material under test the higher the ball rebound towards its start altitude, always less than 100%. To your question .. The same principle operate in a reverse order to let it test how hard our wheel (ball) is instead of hardness of the concrete ...


7

The main issue with the posture images you included (shown again below) is that both positions represent extreme positions and both are likely problematic, despite one being labeled as correct. The image on the left has put the back into hyper flexion, over-recruited the lower abs and tilted the pelvis backwards, this position will likely cause breathing and ...


3

Part of the problem with new technologies is that it is difficult to have a universal standard. Also the as the technology improves things get smaller stronger,cheaper,etc. This causes items to become obsolete quickly. In the U.S. there are several battery specific retailers (Interstate Battery for one) that have the ability to repair or rebuild batteries ...


2

Most modern road bike rim brakes only have clearance for 28 or 30mm wide tires. Unfortunately I’m not aware of any real gravel or cyclocross tire with less than 30mm width. With disc brakes some road bikes have clearance up to ~35mm width. Edit: I should add that older brakes and frames have less clearance, the ability to fit 25 or 28mm tires has really only ...


1

While it's likely that a 50 cm frame is smaller than you'd like (as others have said), there is one situation in which it would be what you want, and that is if you want a really aggressive aerodynamic position. If you watch competitive cyclists, you will see that they generally position their handlebars quite a bit below the saddle height, especially for ...


3

It's a Giant Seek 1, maybe "Ltb" edition, circa 2011-2012. Here's another one.


12

Very unlikely a 50cm (small?) bike will fit you. I'm about the same height and fit a 54/medium in most road bike models. Some people about the same height with short legs fit a 52cm frame with a long stem fitted. The manufacturer of the bike you are looking at should have a sizing guide that takes height and inseam measurements into account. Don't compromise ...


16

This study: William M. Bertucci, Simon Rogier & Raoul F. Reiser II (2013) Evaluation of aerodynamic and rolling resistances in mountain-bike field conditions, Journal of Sports Sciences, 31:14, 1606-1613, DOI: 10.1080/02640414.2013.792945 is very far from comprehensive, but it reports rolling resistances for two pressures (2 and 4 bar - 200 and 400 kPa) ...


1

I currently use a mountain bike to commute to work but I am keen to switch to a bike more suited to commuting Commuting is a form of cycling where several aspects of bike fit are important. Firstly, you do this every day, so whatever position you have should be comfortable. Secondly, you cannot typically freely choose your route and timing but rather must ...


1

Make yourself a soft rubber mould that fits over the bridge of your nose just under your glasses. It will hold up your glasses enough to see perfectly. I use one when riding sports moto bike. If you are unclear what I mean, put yourself in riding position, look forward then put a finger in the centre of your glasses just under them. It will lift them up ...


1

The crankarm fixing bolts are normal, right hand threaded, so removal is anticlockwise. They do call for significant torque (43-48 N-m, one of your pics show). A simple "L" shaped Allen key used by hand may not provide enough torque to break loose the fixing bolt. Using a ratcheting wrench and a socket that terminates in an 8mm hex head might be ...


4

Yes, all Shimano 11-speed road cable pull is the same. The long armed 11-speed FDs like FD-5800, 6800 etc can all be and frequently are replaced with the toggle models, i.e. FD-R8000.


6

I've also got Sora brifters, and the hoods do eventually wear out. I replaced the rubber parts after about 2 years, maybe 20 000km, and several gear cables. They're readily available as spares, but be sure to get the exact model


5

Two things I’ve found which help: First, align them properly. There are slots in the plastic of the brifters and little protrusions in the rubber which are supposed to slide into each other. Second: Degrease with some alcohol. Even better is liquid chalk (it’s magnesium carbonate suspended in alcohol, used for climbing and weight lifting) because the ...


2

Possible issues (probably not a complete list - things I've seen) Dirty rims - if the rim does not provide a consistent friction surface (there is dirt that makes one part too sticky or too slick - brake pad residue etc.) you will not get smooth braking. Dents or blips in the rim - if the rim is wider or dented in some places it will affect braking ...


2

This is the Secteur triple 2013 black charcoal and red. I have the same model


2

A worn chain on new chainrings can lead to “chain suck” i.e. the chain failing to detach from the chainring and getting stuck in the front derailleur. A new chain on a badly worn cassette can lead to bad shifting. Unless the chainrings are already badly worn I’d keep using them (if possible) and the chain and cassette. With new chainrings you might have to ...


3

It doesn't really matter if your freehub body is made for 10 speeds, since Campagnolo has the same body for cassettes between 9 and 12 speeds. The body does not go through the smallest sprocket. The splines on freehub body are not identical and there is one position where the cog fits properly. The lock ring should be not tightened if the cog is not in ...


4

Welcome to Bicycles Stack Exchange. That sounds like a rough time. Sorry to hear that. This might be a convenient time to replace those pieces if they're at that point in their wear life, but if they're in good condition there's no reason to. Unior makes a pedal thread repair kit. If you're comfortable with thread tapping you could give that a look. ...


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