MRP Guide Replacement

[AlsTrance]

Anyone know of a good upper guide that will replace the MRP guide...

MRP Upper Guide - SL Models | Buy Online | ChainReactionCycles.com

The MRP guide seems to be made out of swiss cheese and keeps melting, cracking or breaking. I'm getting sick of replacing it.

Ideas?

[daisycutter]

They are not that weak. Perhaps your chain line is off?

[mbell]

What kind of chain lubr do you use? I know some lube is not good for plastic parts.

[DM67]

Sounds like you may be using the wrong chain lube...



To get the most out of your MRP chainguide or bashguard, and ensure years of reliable function, it is important to take care when lubricating and cleaning your bicycle and drivetrain. There are several solvents, chemical compounds, and other materials commonly found in lubricants and cleaners that can be detrimental to the polycarbonate found on many MRP products. These include:
- Mineral Spirits
- Propane & Butane (sometimes a propellant in canned lubes)
- Acetone
- Ammonia (in some cleaning materials)
- Benzene
- Hexane
- Kerosene
- MEK (Methyl Ethyl Ketone)
- Turpentine
“DRY” lubes often contain solvents as delivery agents and are frequently the cause of premature failure.
Exposure to “citrus” degreasers will dramatically reduce the life of your guide or bashguard.
Common signs that harmful products have been used include:
-Failure without attributable impact
-Small, fine cracks around fasteners, reliefs, and seams
-Plastic that has become brittle over time

If your MRP product has these symptoms it is important to replace all the polycarbonate parts at once. Additionally, it is critical to carefully clean all drivetrain components to remove all potentially still harmful residue. Failure to do may result in product failure and potential injury to the rider. Use of caustic lubes and cleaners voids any otherwise applicable warranty.
APPROVED LUBES
White Lightning
Finish Line Wet
Chain-L
Pedros Go!
Pedros Synlube
Dumond Tech
Triflow (regular)
Squirt
UNAPPROVED LUBES
Prolink Progold
Purple Extreme
Finish Line Dry
Triflow Dry
WD-40
Boeshield T-9

[AlsTrance]

Good point guys. It could very well be the chain lube as I mainly use dry lubes. I've recently been using Shimano's dry lube which I really like so I hope this isn't the cause.

It would be better if MRP could use another type of plastic that isn't so susceptible to light solvents etc.

[swkshepherd]

Good point guys. It could very well be the chain lube as I mainly use dry lubes. I've recently been using Shimano's dry lube which I really like so I hope this isn't the cause.

It would be better if MRP could use another type of plastic that isn't so susceptible to light solvents etc.

I would go back to wet lube (oil-based) as opposed to dry (wax-based). That should fix the issue. If not, it may be a chainline issue.