Pressfit BB86 tools

[BeR]

Hello,

Could you advice me some good tools for installing and removing a pressfit BB86 on Aliexpress.

I have just discovered that there is a remover which let you do it without a hammer. But I fear that the cup push in the carbon frame. What do you think ?
https://a.aliexpress.com/_EG5hL8M

What type of grease/ antiseize do you use ? I plan to use Shimano antiseize.

[ZacItaly15]

I have the press you posted in the link and you can mount and dismount any pressfit bb

[BeR]

I have the press you posted in the link and you can mount and dismount any pressfit bb

You don't risk to crush the carbon frame around the bottom bracket when removing it ?

[BeR]

the tool linked is correct. with the little oval thingy, you can pull out the cups. i have that tool. in the past, they used to not include the oval thingy. There's 20 different bits, so finding the right order is a bit tricky, but once you do, you can extract anything simply by turning the threaded rod, even if the cup is seized in there.
do not use a hammer / mallet, this tool is 100x better.

i use liqui molly 3312, can't recommend it enough.

I have already seen your posts in some threads for Liqui molly .
Even if Shimano says to install the BB without anything, I will use this "silicone grease".

[BeR]

i also recommend the ztto-type bbs from alix, with 2 pieces of alu sleeve that screw into each other. if your frame has good tolerances, it's awesome, and costs c.12 eur.
it must be stiffer than the shimano version, which, as we understand it, exists to be forgiving with bad manufacturing.
in spirit, the ztto thing is a hambini bb, because once you've screwed the 2 bits together, you have a solid alu sleeves across the frame. That's got to be stiffer than 2 plastic cups that barely connect with a piece of plastic.
it's the sort of thing that's incredibly impractical to test, but take an aethos-like bike, which physically looks like a pool noodle, and run stiffness tests with a shimano BB and that ztto BB. I'd be curious, but there's got to be a difference, right? Also, there may not be. But for 12 eur, me likey.

I read that Patrick (Lino) had a problem for removing his "thread" press fit bottom bracket.

Or this problem : (from 3m40)


I fear to have this problem too.

Moreover the width of the dentures around the BB seems very narrow. Even with the right tool, there is a risk for damaging the dentures by slipping.

What do you think ?


For the strength, I can not tell if there is a big difference. There are some pro bikes (Giant Propel Sl, ...) which use only pressfit and it does not seem to affect their performance.

[BeR]

i've installed quite a few of them, never had issues. you have to be careful when using the tool, sure, but that's true for everything on modern bikes. I've installed BBs with 3d printed tools, even that works well enough.
the shimano one is the standard, for sure it's "good enough". I can't say the alu one is better either, all i can say is that's what i m using because it's served me well on quite a few bikes.
on my giant propel, there was a piece of carbon at the bottom of the frame that forced me to use the shimano cups, because the sleeve didnt have enough clearance.

There's so much emphasis put on BB stiffness (probably for good reason) that i'm not going back to plastic cups unless i dont have a choice, or until proven that a rigid tube of aluminium makes no difference vs plastic ass cups.

I am not an expert but the contact points are almost only where the bearings are and a line needs two points to be straight.
If we suppose that the crankset axle can not be deformed between the bearing, there is no need to reinforce the BB part inside the frame. The only part that has to be stiff and strong is around the bearing. So the question is : Is plastic can be deformed more than alu only around the bearing ?

My english is si awful and I don't if you will be able to understand me and if a physician can (not ?) confirm .

[ZacItaly15]

You don't risk to crush the carbon frame around the bottom bracket when removing it ?

That's what happened to me ,  prior to understand how to properly use.

I lightly scratched my frame, then I realize I was not preparing correctly the pile of spacer.

Sometimes a plastic bag (or baking paper) can help

[BeR]

That's what happened to me ,  prior to understand how to properly use.

I lightly scratched my frame, then I realize I was not preparing correctly the pile of spacer.

Sometimes a plastic bag (or baking paper) can help

So maybe the old hammer method is still the best ?

[trailgazer]

Beware of the version you buy on Ali, I accidentally bought the one in a carton box. That's no good. Better get the one in the plastic suitcase.

[BeR]

Beware of the version you buy on Ali, I accidentally bought the one in a carton box. That's no good. Better get the one in the plastic suitcase.

Do you have the right link ?

[ZacItaly15]

So maybe the old hammer method is still the best ?

the hammer , as you know, is the "chief of shop", but must be used gently.
I try to use the hammer as little as possibile in order not to ovalize or damage the bottom bearing seat

Trust me, the Aliex cheap black press is really effective but must be used properly