[Themadchemist]

Looking to replace my Ultegra 6800 crank/chainset on my S Works SL4. Replacing for 2 reasons.. going to 170 as it came with 172.5mm and all my other bikes are 170mm ,but also because I read more and more about breakages of these bonded cranks.
But what do I replace it with? I’d like to keep the 24mm bottom bracket as,so far,it isn’t creaking like some do in these frames.
I’ve looked at Rotor,which do 24mm axles and do like the look and the fact I can go for oval rings… but they ain’t cheap. Just thought I’d post to see if there are any other options.. or has anyone tried the new Shimano cranks.. have they sorted the problems?

Topic

[vthejk]

Rotor 3D+ cranks are great. I

Rotor 3D+ cranks are great. I have them in a 30mm spindle diameter to fit my Rotor T47 bottom bracket, but they do make them in a 24mm to fit a typical Shimano Hollowtech-II compatible bottom bracket. As with the Praxis cranks mentioned below, pretty sure you can also use direct-mount chainrings, a 5-tooth spider or a 4-tooth spider. I use a 5-tooth 110BCD spider, which very handily fits Praxis chainrings too so you’re not splashing out.

Another plus – if subjective – they look fantastic, too!

 

[vthejk]

Pretty sure Praxis use

Pretty sure Praxis use irritatingly assymetric spindle diameters across their cranksets that only work with their own bottom brackets. (For instance, their 30mm spindle is, in fact, 30mm in diameter on one side and 28mm on the other!)

[Compact Corned Beef]

I like Praxis cranksets and

I like Praxis cranksets and they can be had in a ton of different options – spider, direct mounts, traditional chainrings – plus a few different axle options too, though I’m not sure if there’s a version that would work with a shimano 24mm BB.

[The _Kaner]

I run Rotor 3D24, 165mm
I run Rotor 3D24, 165mm cranks on a Power2Max NG Eco spider and 52/36 Absolute Black chainrings. These replaced a 6800 setup. Aesthetically better looking than the Shimano, and stiffer. Also replaced the BB with a Token Ninja TF24 so no more creaky pressfit shizzle.

[IanMSpencer]

Friend in club has Rotor and
Friend in club has Rotor and is very happy with it, including Q rings, though he was not entirely convinced what difference they made. His problem was keeping going in his late 80s.

[Themadchemist]

SRAM RED is a good shout.. I
SRAM RED is a good shout.. I’ve seen Tom Boonen using it on his SL4 (probably 10spd back then).. but I’d need to change my bb and I have no idea what I need.. the press fit world baffles me. I even read something about epoxying it into the frame.. so I agree with your comments on pressfit.
From all the comments so far it looks like 105 could be the way to go,which would be an easy fix to get the bike back out on the road.
I’d still like to know what people think of Rotor,as I was told the Q rings would help my knees..

[Stef Marazzi]

105 chainset sure is the way
105 chainset sure is the way to go. 39 grams difference between 105 and Ultegra that you’ll never notice, and don’t seem to suffer from the reported bonding problems. About £130-ish quid if you look around.

[check12]

SRAM red is a good shout but

SRAM red is a good shout but you will need a new BB (or convertor) as SRAM cranks are 24mm at one end and 22mm at the other. 

[Daniel Norton]

If weight is your priority,

If weight is your priority, then you can’t beat a SRAM red crankset.  You can pick them up on eBay for a pretty good price, but you would have to change your bottom bracket.

I’m guessing you are lumbered with press-fit BB on a frame that is otherwise brilliant.  Whoever tried to force press-fit onto the cycling world should take a walk, then walk a bit further, then keep walking until they reach the sea, then…  I hate press-fit.  Been there and would always avoid in the future.  Shite!

 

[Richbeck]

+1 for middleburn. R02 is the
+1 for middleburn. R02 is the one you need.

[Themadchemist]

Yeah,I’d been told 105 are
Yeah,I’d been told 105 are constructed differently ,not bonded like my 6800 and modern ultegra and Dura ace.
105 might be a cheaper option,but i am trying to keep the weight down.. hence looking at Rotor. Anyone have any experience which Rotor..positive,or negative?

[ktache]

Middleburn.

Middleburn.

[markysparks]

I was in the same position a

I was in the same position a while back and changed to a 105 crank/chainset (R7000) which has been trouble free. Cheaper and only a little bit heavier than Ultegra. Apparently 105 is constructed differently to Ultegra and Dura Ace and hasn’t suffered from the same breakage issues you mentioned.

[wtjs]

Ask HP, and stand back!

Ask HP, and stand back!

[Steve K]

What about 105 cranks rather

What about 105 cranks rather than Ultegra?

[Author]

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