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comment Grinding sound from rear wheel
Some (many) hub bearings can be repaired depending on how serious the damage is so a bike shop may not charge a fortune. Having the whole hub replaced and therefore the wheel rebuilt would probably be a similar cost to a new wheel. But I replaced a wheel recently and although I spent about 100 EUR I was after something very slightly out of the ordinary, which more than doubled the cost.
Feb
11
comment Safe to ride with Kenda 27 x 1/38 inch studded tires in snow/ice?
Reading a related thread and the sources behind one of its answers earlier, I got the impression studded tyres were hard to find for 27". I second your recommendation though.
Feb
11
comment Slipping aluminium seatpost in aluminium frame
On one of my bikes I've just tried (haven't ridden yet) a second seat clamp just round the post, that will sit on top of the seat tube. In my case the bike is old so I've got nothing to lose by doing this (and steel framed so the frame is tougher than the extra clamp). My reasoning was slightly different -- the built-in clamp doesn't play nicely with pinhead bolts and I can't get much torque.
Feb
8
comment What speed of wind gust will cause a cyclist to swerve by 1m or more?
But delaying the correction may be exactly what's needed if it buys you a little time. It would take someone following with a camera to be sure but it felt like I was throwing my weight into the wind. +1 for calcs etc. although 1s reaction time seems pessimistic.
Feb
8
answered What speed of wind gust will cause a cyclist to swerve by 1m or more?
Feb
6
comment Half speed internal hub gear?
@David subject to the derailleurs being able to handle the step size and chain length difference, yes. But I suggest you don't need to spin out at walking pace. 50-60 rpm at walking pace would be enough. On good ground I can go down to very slow walking pace by giving the pedal a little push then backpedalling the same amount before coasting.
Feb
6
comment Are folding handlebars a good idea from an engineering standpoint?
I don't like the idea, but I have to say I disagree with you: Let's say one hinge pin falls out as a result of vibrations -- most riders can steer with one hand and there's still one brake. If the handlebar failed going over a pothole, things would be much worse, as you'd likely go over/through the bars. But assuming these are going on small-wheeled folding bikes, avoiding potholes would seem to be a very good idea. I'm unlikely to buy a folding bike as I'm big and heavy and treat my bikes rather hard, similarly I wouldn't buy these bars.
Feb
4
comment How to carry a step-through/mixte bike
If the geometry allows it this would be quite nice - but as you say it's mainly in the asence of panniers.
Feb
4
comment How to carry a step-through/mixte bike
OK, that's a lighter motor than (the rear hub motor) I'm used to and better battery placement for lifting. Though in some commercial e-bikes the battery could be removed and carried in the other hand.
Feb
4
comment How to carry a step-through/mixte bike
@mattnz +1 (FWIW) for the strap - just don't forget to take it off before riding in case it snags. I reckon a long cable lock could be used for this.
Feb
4
comment How to carry a step-through/mixte bike
The top picture in your link is how I'd do it, at least for moderate distances. It's rather harder/messier with the e-bike that has no top tube at all and is back heavy but it still works.
Feb
4
comment How to carry a step-through/mixte bike
You must have quite good grip strength to have done this with an e-bike. How was the balance on that? Because the ones I'm familiar with are quite back-heavy.
Feb
3
awarded  Popular Question
Feb
3
accepted Riding into a headwind faster than my top speed - how is it possible?
Feb
3
comment Riding into a headwind faster than my top speed - how is it possible?
@R.Chung, thank you -- that's great.
Feb
2
comment Can Park Tool CG-2.2 kit work with the bike upside down?
@DanielRHicks these (or at least the cheap ones) also work if you run the chain through them the wrong way, so you don't need the handle on the inside. In fact I tend to run mine say 30cm backpedalling then 10cm forward as oterwise there a sponge that pulls out.
Feb
2
comment How many watts is a good push worth?
OK. That's interesting. Do you approach with very little extra speed then?
Feb
2
comment How many watts is a good push worth?
Although a decent push will give you a physical boost a major benefit is likely to be the encouragement it gives you. The feeling that you can do it, and that if you don't you'll be letting someone else down after they helped you is quite powerful. There's some pretty strong evidence that you've got quite a lot in reserve when you're exhausted.
Feb
2
comment How many watts is a good push worth?
In your last para I reckon you can treat it as a zero-sum exchange of momentum: for riders of equal weight every unit speed you give the other rider you lose. The speed difference can't be too great or it would be more a case of ramming the other rider, so the pusher is almost bound to end up quite a bit slower than the pushee. I assume here that the pusher can't suddenly increase their effort after making contact, because riding one-handed close to another bike up hill (and with the turning force of pushing with a hand to one side) isn't a good time to really pound the pedals.
Feb
1
comment Riding into a headwind faster than my top speed - how is it possible?
I certainly like this approach -- if we consider a rider who can track stand/balance with the brakes on (or even a tricycle) no power should be expended at zero ground speed. Do you have a citation for the formula with {V_air^2}{V_ground} in it? I looked last week and couldn't find anything like that.