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It's not possible for the operation of the gears to change just by reinstalling the wheel, so it seems likely that you have just misremembered which way this bike normally operates, which is different … Looking at the photos as you have presented them the harder gears are the lowest numbers and the easy gears are the high numbers, so the derailleur is obviously a 'low-normal' derailleur and has always …

This is counter intuitive and can be difficult to start with, but you will develop the habit soon. It’s quite normal across nearly all bikes. What’s happening is, you’ll notice that when you switch …

If you have put a brand new Tiagra derailleur on your bike with 10 speed Ultegra then you have installed an incompatible derailleur. Shimano altered the cable pull for the Tiagra 4700 edition and it n …

Those teeth aren’t broken; as you suspect they are thereto help the chain slip off and onto the little ring. As for the spacing, it looks to me like 2 groupings roughly opposite each other at approx …

It isn’t really identifiable, it’s not the original bike that left the factory. The bike has been altered a lot from new, it looks like currently it is a singlespeed, flat bar conversion with front br …

It does look like the cable has missed the channel it should come up through the mechanism vertically, i.e. it is at the yellow arrow but should be at the blue arrow aperture (if I'm identifying the c …

At the low end, small changes in gain ratio make for significant perceived differences, i.e. when you're running out of gears fast for that climb! … The 0.53, 0.68 numbers are multipliers for each of the IGH gears, think of them as gears 1 thru 11 for the Alfine. In the IGH table you'll see eleven of these headers, and one gain ratio for each. …

It looks to me like a stiff link in the chain. In the video there is a noticeable jolt in the chain through the derailleur every time there is a noise. The chain makes a full revolution only every f …

I think you’ve told it to do an Alfine hub with all 3 chainrings and all 10 cassette sprockets, so the computer is obliging. Just include one chainring and one sprocket value to get the Alfine table …

As per AndyP’s comment, I have also heard anecdotally that these styles of shifters can be stiff for children’s hands, but then again some thumb push trigger shifters can feel quite stiff to my adult …

It will make a significant difference and increase the top end speed for a given cadence noticeably. Gravity is your friend though going downhill, it’s not like the higher gearing of 48x11 will make y …

Leave the wheel in tact and see if you can order some 'turbo trainer axle nuts', pictured below, to replace your current nuts on existing axle. If these don't work for you then start disassembling the …

You can find out how many gears the Tiagra levers expect by counting the number of clicks they make and add one (9 speed clicks 8 times each way). Then the number of cogs on the block must match. … You can 'cold set' a steel frame to increase the spacing to accept a new, wider rear wheel for more gears if needed, but this is likely to require going from 120 mm to 130 mm which is relatively large …

You state in the comments that the (pinch) bolts on the left crank had come loose (Ultegra Hollowtech 2). So you’ve solved the problem by tightening the bolts. I saw another bike (I think Ultegra cr …

Only cut the inner cable when you’ve finished installing the cables and indexing the gears. That way you can remove and re-thread the cable any time if you make a mistake anytime. …