Vanthel

Hey,

I've gotten my hands on a 7800 Dura ace chainset that look in great condition and used for 2 seasons, I have no clue to the servicing of the BB.

Anyway, I currently have a Tiagra chainset (bike is full tiagra), would it be worth installing the dura ace chainset? and am I right in saying I need to get 7700 chainrings to make it compatible with the 9-speed chain?

My concern is that I fear the DA BB will need tuning etc frequently compared to the tiagras (which I see as plug and play so to speak). Also am I likely to notice the increased stiffness/weight difference or will it just be countered by frame flex (frame is aluminium).

Thanks for helping!

theextremist04

So you're iffy about upgrading 4 component groups for cheap? If you're that worried, get a new set of BB cups, they're not that expensive. And 10speed chainrings will be fine with 9speed. Do it, there's no reason not to.

Vanthel

Well I guess it's just if I am unlikely to see a difference I could just sell it on..
Am really tempted to get the 7700 triathlon aero big ring because it looks cool and i'm a sucker for that kind of thing!

I may have got the tuning idea wrong, does anyone know if the DA will require more or less upkeep than the tiagra?

While I look after my bike like it's a family pet, taking components apart to service isn't my thing as I reckon i'd mess it up and over grease or tighten something too much etc.. therefore I like to avoid this as professional services are expensive(for the bike that is!)..

I'm sure I sound pathetic!

theextremist04

Less work, definitely. And don't get the TT version, it's pointless unless you live in a place where it's perfectly flat with no wind.

Landgolier

Upkeep? It's a crank and cartridge bearing bottom bracket. You install it. Every once in a while you make sure everything is still on there tight. When the BB is shot, replace it. When the rings are worn out, replace them. No "tuning" to any of it.

You don't need new rings, 9 speed should run fine on 10 speed rings.

Vanthel

rightey ho looks like i'm putting em in then!

Thanks for the advice, saved me a bit on the rings!

cyclingvirtual

i would have sold the chainset if a profit was to be made.
It was unlikely to make you faster.

Vanthel

i'm fully aware it won't magically make me go faster, just I can feel the flex in my current cranks, or somewhere, when I stand up and attack.. it's that softness I would like to try and reduce.

If it's in the frame then it's something i'm just gonna have to live with as I don't have the money to change it. So will see how this feels, just got some carbon shoes as well. I assume the cheap ass pedals I have won't make a difference..