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3

As I said in a comment, there are 25+ years of 105 and Ultegra (well, ultegra was called something else back then, but the line has been around for quite a while), so you need to find the right 105/Ultegra you're talking about. You can find the Product Info at this link. In 11 speed: The Ultegra RD-6800-SS and 105 RD-5800 SS both have a 28t max. Thus, ...


2

When you upgrade shifters (provided you have the right compatibility), you're paying for (or trading off between): Lower weight More strength/durability Reliability In the sense that Alivio > Altus, you should be getting some of these. However, if your shifters and what not are in good condition (i.e. good cable runs, shifters in good condition, ...


1

Don't buy that XT groupset for that bike to solve those problems - it wont work. XT is great, but it won't make your bike more comfortable, and it wont make it better off-road. Worse, it wont work for that bike since it has V-brakes, and that groupset has disk brakes. They are not compatible. To make it better off-road you need (in this order) better ...


1

From the picture, and what you describe, the tire is wider than the rim. This means that if you like to run the brake shoes close the rim that you'll be unable to remove the tire without having to find some way to "lengthen" the cable. There are three common options that I know of: A release lever on the brakes. It appears that you have one. I think that ...


1

For the 5800, short cage can only take 28t but I wonder this too after seeing this.


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When you do drive train swaps, you need to check the chain length, and the capacities and limits stated on the front and rear derailleur (look at their data sheets). 1) Check the data sheet for your front derailleur. It will specify the sizes of the chainrings and the teeth differences required. Almost surely it will be fine though. You'll have to fidget ...



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