By chance I just did a Tekro-ectomy on my bike to Shimano 105's. I got the 105's off of ebay for a little under $50 shipped (believe it or not!). They're slightly used and came off of a 2011 Felt F5 Team Edition bike.
It's not so much that Tekro sucks or that they flex. The problem is that depending on the model you have, they don't give you much mechanical advantage. Comparing my old circa 2005 Tektro brakes to the circa 2011 Shimano 105's, it's easy to see the design differences between the two, and how Shimano moved the fulcrum point to give you more clamping power.
Last year I had to replace my shifters since the right one failed. The bike came with the older Tiagra 9x3 shifters that were Flightdeck compatible, but when I went to replace them, the highest grade I could get was again Tiagra's, but they weren't Flightdeck compatible though.
(They're 2011 ST-4500's BTW).
I was never thrilled with the Tektro brakes and after replacing the shifters the brake response got worse (probably because of the cable pull change). I know that has to do with how Shimano redesigned the shifters, but the Tektro brake calipers weren't anything to write home about before either.
Even with the stock pads on the 105 the difference between them and the Tektro is just nuts. It took me a day or so to stop locking up the rear wheel because i was so used to applying a death grip before with my Tektro calipers. Still with the stock pads it's amazing just how much of a difference there is (to me) between the two. I can come to a complete stop from the top of the lever hoods and hold the bike stationary on a hill whereas before I had to clench the brakes tightly from the drops to keep the bike from rolling.
Will *you* feel a difference? It depends really. With older shifters you will either notice that the brakes may be super-touchy or they may feel like mush. Personally I think it'll lean more towards super-touchy and that you'll have to adjust the brakes so that you have more control over them.
Even after replacing the brakes there is still a little bit of spongy-ness in the rear brake. That has more to do with the brake cable (the extra length compared to the front brake). Other than switching to a hydraulic system there really isn't any way to prevent that though.
BTW, keep in mind that you can just replace the rear caliper instead of doing a full swap. I got really lucky in that I got my 105's relatively cheap for a set, but you can get single calipers relatively cheap on ebay (new ones too).
Originally Posted by DARKSCOPE001
Ok guys thanks for all the replys. So I just found out new 105 leavers are out of the question as they have the new updated cable pull instead of the traditional cable pull of my 2007 105 brakes.
So If I did want to upgrade my brakes I am not thinking about either sram force (dual pivot) easyer to set up with traditonal QR Hard to find reviews on them but they seem really nice and are about 150 on amazon.
Also thinking about those planet x brakes and have been reading up plenty on them, They seem really nice and have mixed reviews some say they are amazing once setup properly, I have also read that some of them are coming with ashima pads instead of swiss stop and as soon as you swap them out for swiss stop they work great.
I was wondering if any fellow clydes could chime in and give me a recomendation? Will I notice any increased power while swapping over to either of these brakes? My current brake setup is the tektro quarts and I have kool stop dura 2 in them and they seem much better than before but still not as nice as I was hoping.