I'm feeling the same. My dualsport MC gets no love, just enough maintenance to keep it from giving up entirely. Having to oil the gearbox on my bike gives me a reason to also spray the chain down and relube. That said I do love the inclusion of a grease/oil retention system.
Can you point me in the direction of the threaded free wheels you speak of? I'm not familiar.tangentdave wrote: ↑Dec 25, 2017 2:41 pm
We do need a higher quality 24t chainring. The soft cheapo one from Sickbikeparts is only like $5 and seems to last at least a while, although a worn sprocket will wear the chain faster. The bolt pattern for the SBP 24t is 5x2.63", which is the standard bolt pattern for the threaded freewheels, it uses the same bolt holes as the spider I make to attach to the crank FW.
tangentdave wrote: ↑Dec 27, 2017 2:14 pmChainring bolts are 10mm diameter (I cut a 10.1mm bore) and the profile to countersink the bolt should be 13mm diameter and 1.5mm deep. Thanks
EDIT: I just loaded the picture from the website into CAD and taking the relation of the known BCD=64mm I calculated the hole to be M8, which is exactly the size of the male portion of the chainring bolts. Granny rings are often just held in with the male bolt,, foregoing the female portion. As I think is the case here.
Perhaps it'll be easier to laser/waterjet a sprocket out of stronger steel rather than stuff more features onto the spider. Don't forget about the flange on the FW that'll interfere with granny ring bolt circles (have to modify the flange somehow or put the granny ring far away).
Yes I would tend to agree. The only reason that I favor modding the spider is so that off the shelf chainrings can be purchased in many different flavors. Regarding the flange on the freewheel, I will probably have to recess it a bit if it's a thru hole design or create some threaded bosses so that the sprocket bolts can be just threaded into the spider. Personally I'm not a fan of threading anything into aluminum unless there are some helicoils present. In the case of a threaded design It would mean that the spider is non reversible and fine tuning with shims for the chainring may be necessary, not exactly a problem for my setup. Again I'm not exactly thinking about a mass produced piece that is has some inherent flexibility in it's design for adapting to fit many different bikes, but just something that will be more suited for my bike.
Or, duh, maybe we can just drill the Blackspire ring to accept the M5 5x2.63mm bolts...
That would be idea it looks like the inner portion of the chainring is cut away except in the areas of the 64mmBCD, it looks to me that there is no room for that.