SHIMANO Tiagra FC-4700 Crank Set 50/34, 10-speed black 2020 Chainsets Mountain bike

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I don't understand where the leverage ratio comes in to the degree that the brakes won't work, and thus must be used with...

So it looks like you'll pull 3.78mm when you really want 3.92mm on a 10 spd cassette (the pitch tables say 3.74mm and 3.95mm - presumably due to rounding effects) It didn't occur to me until afterwards, but on one stage of last year's Ride Across Britain I found it a struggle to keep up with a group who had seemed to be riding at my kind of pace, despite it being flattish, and I wonder whether that was simply down to me spinning a slightly lower gear than the rest of them. Good excuse anyway... The Tiagra 4700 brifters are similar, but are 488 grams and 10 speed. Shimano claims these brifters are ‘SLR EV’. R2000, R3000 and 4700 should all have similar performance to previous generation 105 5800.The chainsets correspond more to Tiagra and 105 in their weight/construction, not Tiagra and Ultegra. The other major difference between the two groupsets is that the 105 brakes are considerably better than Tiagra ones. They are a real highlight both in terms of all-out power and fingertip control. But we think they have a place for general riding too. As soon as you hit seriously hilly terrain, there's going to come a moment when you need the lowest gear you can get. You might have blown up, you might have hit a 20% grade or steeper. Options like FSA's Adventure series cranks, Sugino's OS cranks, or the Praxis Works 48/32 cranks give you a slightly lower gear range for those situations. Shimano presents these brakes as having the capacity to take up to 28mm wide tires. What we found is that the newest 105 - the R7000 has more drop than it used to (51mm vs 49mm).

Should one consider a rule of thumb to be that a chainset should not be more than 1 speed higher than the your groupset's speed? RX600–1 and RX810–1 use the same chainrings, which are described as 11-speed, but in fact there’s no difference at all between an 11-speed and 10-speed 1x chainset. There are 40t and 42t chainrings. RX810 has hollow crank arms, while RX600 is solid. This means 644g vs 743g.A run-down about which speed chainsets work with which speed groupsets would be very helpful for me to read. Seems for example if your bike has an 8 speed groupset (still not at all uncommon on entry level road bikes), your options for chainwheel upgrades are very limited. Is a double 9 speed chainset ok to put with a double 8 speed group? I've been told that with a double 8 speed groupset a 10 speed would have issues and 11 speed a no-go with major issues. For 8 and 9 speed chainsets, it doesn't seem there are a lot of options to chose from. With speeds having increased a lot of over time looks like there are no high spec (lightweight) 8 and 9 speed chainsets made by any manufacturers nowadays though maybe I have missed something.

Nobody needs 11t, who is not racing. And 2t jumps are just incredibly annoying, making it impossible to keep a comfortable cadence.But I'll bow to your experience and see if one of my 10 speed chains will work with my 11 speed set up. Makes sense as there's bugger all difference between 10 & 11.

As you can see there isn't a huge amount of difference in the weight of these two so the biggest difference is that the Tiagra brake levers run a 10-speed system whereas 105 is an 11-speed. The figures for 11spd are 2.7mm x 1.4 = ~3.78mm pitch. The mech ratio is the same 1.4 but the shifter is pulling less cable, so the chain movement is less.Should you decide that you want to start with the 105 version, you will arguably have more options. Or at least, upgrading can be done more easily. Of course everything comes down to price. With money no object, Dura-Ace is the best. But Ultegra is almost identical and costs much less. 105 is identical in terms of its basic function, but the rear derailleur is not as good quality as the Ultegra, although this is not a big deal in that it’s a cheap and easy replacement if/when you wear it out. So 105 is also an excellent choice. I have what is mainly a 10sp triple Shimano 105 setup (5703) and a Shimano XT Shadow 9sp (M772) rear derailleur on my 'winter' bike. In my experience it shouldn't require any special contorting at the pinch bolt (the so-called 'hubhub' method?) and the only adaptation I've had to make is to cut the cable outer to insert a Jagwire inline adjuster as this particular model of rear mech does not have a barrel adjuster.