The right grease

For discussions about bikes and equipment.
Tonyf33
Posts: 3926
Joined: 17 Nov 2007, 3:31pm
Location: Letchworth N.Herts

Re: The right grease

Postby Tonyf33 » 3 Oct 2010, 5:16pm

There are 2 types of molybdenum lithium grease. The disulphide (S2) version is for high pressure applications. A more viscous grease with higher penetration rates I dont think really applies to cycling even less so at the level we are talking about. The 1500 stuff may well be fantastic but then again I would buy sealed ceramic/silicon nitride bearings in that case if I wanted that low level of resistance you are hoping to achieve by having such a viscous grease. I'm sure the SCH 460 is likely to be a great product and certainly more suited to cycling applications than the 1500 to be fair.
Personally I wouldn't pay the small extra amount for a disulphide moly grease with the low heat/pressure/rotations that we produce, a standard moly grease with as high a viscosity rating at 40C will do.
Unless you do a like for like riding/maintenance over x period of time then in practise it is impossible to compare.
I'd rather stick with technology (the moly grease) that I know will give reasonable wear protection for a given material that doesn't cost me the earth to buy over a product 4 times as much for a (potential) relatively small increase in performance.

I've all but gone to sealed bearing units on all my bikes and to be fair although sealed units cost more up front it is a case of fit & forget. On the flip side I stripped a friends bike and repacked a 30 year Tange bottom bracket with bog standard Lithium grease from Wilkinsons & it was running as smoothly & freely as my Dura Ace BB with absolutely no play...go figure :o The best bottom bracket I ever owned was an old sealed THUN unit, crazily low resistance
:shock:

User avatar
CREPELLO
Posts: 5558
Joined: 29 Nov 2008, 12:55am

Re: The right grease

Postby CREPELLO » 3 Oct 2010, 5:20pm

7_lives_left wrote:Here's another bit of speculation without any knowledge or experience to back it up. Moly grease will be dark in colour, whereas lithium grease or the fancy Mobilith greases will be clear or light coloured. If the bearing gets contaminated with dirt or debris from a failed bearing surface, you will easily see the discolouration with the light coloured grease but it will be more difficult to spot with molly grease.

I would welcome someone more knowledgeable telling me if I'm talking rot or not.


Yeah, I've used the grease colour to assess the detoriorartion of the bearings in hubs. So light = good condition and dark = something's up.

User avatar
Mick F
Spambuster
Posts: 46070
Joined: 7 Jan 2007, 11:24am
Location: Tamar Valley, Cornwall

Re: The right grease

Postby Mick F » 3 Oct 2010, 7:01pm

I started this thread off because I was asking about the "Right Grease" for bicycle applications.

I seem to be reading another thread!!:
viewtopic.php?f=15&t=42708

Seriously, though, what's going on? I want the "Right Grease", and am prepared to pay for it. CJ has recommended one and it's very expensive, but the cheaper alternative is just about as good.

Now we have Tony suggesting that it's a waste of time.

???????????????????????????????????????
Mick F. Cornwall

User avatar
7_lives_left
Posts: 798
Joined: 9 May 2008, 8:29pm
Location: South Bucks

Re: The right grease

Postby 7_lives_left » 3 Oct 2010, 8:11pm

What can I say? CJ's original post says what is required of a lubricant for use on bike bearings, how it does it's stuff, and then points us to a product that does that with bells on. Plus we have the manufacturer's data for the product and and their application guide describing the product's intended area of use.

The grease that Tonyf33 links to may be wonderful stuff and you can't complain about the price but we don't have the same data on it, so we can't be sure what we are getting and as it has MoS2 in it, it will be more difficult to visually spot contamination when servicing.

I''m not worried about how freely the bearings rotate, I am more concerned with ensuring that they have as long a service life as possible.

MickF, I would suggest carefully rereading CJ's original post.

kwackers
Posts: 13393
Joined: 4 Jun 2008, 9:29pm
Location: Warrington

Re: The right grease

Postby kwackers » 3 Oct 2010, 8:50pm

The only time I've ever worn bearings out on a bike are through neglect. (Rusty bearings don't last that long).

In the same way my chains last well over 5,000 miles with just a regular squirt of chain lube so I reckon my bearings will last a lifetime simply by keeping them 'wet' with whatever I have to hand in the shed.

(Mind you I'm particularly precious when it comes to oils and greases for my machinery - but then when a set of bearings run you £400+VAT and they don't last a lifetime you've got to be).

Tonyf33
Posts: 3926
Joined: 17 Nov 2007, 3:31pm
Location: Letchworth N.Herts

Re: The right grease

Postby Tonyf33 » 3 Oct 2010, 9:06pm

I'm not saying the expensive stuff isn't the better product far from it, I'm saying can it be cost justified.
I give the information to the best of my knowledge and where to look for stuff at a good price. I'm quite sure that people are able to do their own research using all the information available & from others own personal experiences & come up with the right choice for them.
simplez

User avatar
Mick F
Spambuster
Posts: 46070
Joined: 7 Jan 2007, 11:24am
Location: Tamar Valley, Cornwall

Re: The right grease

Postby Mick F » 4 Oct 2010, 11:59am

7_lives_left wrote:MickF, I would suggest carefully rereading CJ's original post.
Sorry, I've read it many times and fully understand it. I don't know what you're getting at. Perhaps I'm being thick. :oops:

Have i got all this right? ......
CJ would chose Mobilith SHC 1500, but in the absence of it, he would suggest XHP 222 as a second choice but smelly, so SHCPM 460 was picked.

531Colin has said he would organise the purchase of 24 sachets of SHCPM 460 and I'm happy with that.

Now we have Tony suggesting that what has been decided is OTT for bicycle bearings and standard Moly grease will do.

I'm confused ..............
Mick F. Cornwall

User avatar
531colin
Posts: 12468
Joined: 4 Dec 2009, 6:56pm
Location: North Yorkshire

Re: The right grease

Postby 531colin » 4 Oct 2010, 1:47pm

Tonyf33 wrote:I'm not saying the expensive stuff isn't the better product far from it, I'm saying can it be cost justified.
I give the information to the best of my knowledge and where to look for stuff at a good price. I'm quite sure that people are able to do their own research using all the information available & from others own personal experiences & come up with the right choice for them.
simplez



OK Tony, thanks for that, thats pretty clear, even to a numpty like me. And thanks for your input, sorry i didn't understand it!
CJ's favourite is better than the Moly. grease, so if we dont mind paying for it, as far as I'm concerned, all is well.
I will have a look to- night and see if I can get up to 24 tubes.