With the 11-speed 105 groupset, there has been quite a lot of technology which has filtered down from the top groupsets of Dura-Ace and Ultegra. The Tiagra groupset is heavier. As with pretty much everything in road cycling, you pay more to have lighter components. Dual Brake Levers - Mechanical

Tiagra brakes have also seen a good amount of improvement and an increase in stopping power. However, they aren't of the same quality as 105.The changes that Shimano has made mean this groupset is now much more similiar to the company's more expensive groupsets in appearance, ergonomics and functionality. If you're upgrading from previous Tiagra or a lower level groupset, you'll really appreciate the improvements. Shifting up Are the latest Tiagra rear derailleurs compatible with 105 (5700) 10 sp. shifters? (And vice versa, ie are new Tiagra shifters OK to work with a 5700 105 derailleur?) Nobody needs 11t, who is not racing. And 2t jumps are just incredibly annoying, making it impossible to keep a comfortable cadence. When you look at these derailleurs, they are different in appearance. The 105 R7000 groupset uses Shimano's "compact toggle design". However, a triple chainset is only available with Tiagra so that is something Tiagra has over 105. Dual Pivot Brakes

For riders who need a shorter crankset, they will need to opt for 150 R7000 as it is available in 160mm.The 105 hydraulic STI units for disc brakes are 11-speed, as you'd expect, while the Tiagra are 10-speed. The new 105 R7000 STI units are considerably streamlined compared to both their predecessors and the Tiagra versions. The lightness needed in shifting is similar (if not the same) to that of an Ultegra or Dura-Ace setup. It probably sounds like an attractive option right now, but I have to say, as somebody who has a 105 groupset, I won't be upgrading my components to Ultegra or Dura-Ace. I don't feel the need - the 105 groupset is fantastic and relatively budget-friendly. Due to the fact that Shimano uses a 160mm rotor, you won't need to apply lots of pressure to the brakes.

I replaced the long cage Tiagra 4700 with a shortcage, and went for the 105 10 speed (5700) which you would think would be a straight swap... It's not. Shimano says both 105 and Tiagra have room for tyres up to 28mm wide. However, the latest 105 R7000 brakes have slightly more drop (the distance from the mounting bolt to the brake pads) than before: 51mm v 49mm. That implies you should be able to run 30mm tyres with the right frame.Tiagra offers excellent value for money but 105 is certainly the better groupset and we’d recommend going for it if your funds allow because of the better brakes, the small weight saving and the upgrade to 11-speed. no offence, but it was obvious fact since the 47.. came out, that it uses a different actuation ratio as that of older 10 spd components. You won't be able to get any larger than 53 teeth with Shimano, unless you're prepared to go up to Dura-Ace.

Overall, a Shimano Tiagra groupset is quite a bit heavier than a 105 groupset, but almost 200g of the difference is in the chainset Right now my fitness isn't what it was so finding myself spinning on the smaller front ring just for bigger hills, which I never used to need to do. However I think this will only be tempory as fittness is noticably getting better again day by day.

SRAM GX Eagle XG-1275 12 Speed MTB Cassette

It's not as simple as upgrading your Tiagra groupset components one at a time. You can't make the 10 and 11-speed parts work together. If you go for 105, on the other hand, you could swap to Ultegra or Dura-Ace gradually as each component wears out. That might be attractive, but only if you’re realistically likely to do this. If I was buying a bike with the new Tiagra groupset, such as the Raleigh Criterium Sport, I would be very happy indeed. It does everything you want from a mid-level road bike with only a few very minor quibbles. The biggest decision to make when buying a bike at this price is whether you're really fussed about having the 11-speed of Shimano's more expensive 105, and will come down to your budget.