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Re: BigRock carbon crankset with 24mm titanium spindle
Quote from: averagejoe101 on August 30, 2025, 03:12:39 AM
Exactly the same issue I was trying to resolve yesterday. My main reason for tinkering was to try to eliminate intermittent outboard chain drops with an Ultegra 12sp FD w/Pass Quest chainrings & Xcadey PM on a Speeder SC-R55.

The FD's limit is maxed out and still tries to push the chain too far at least once or twice a ride, which is significantly more than I feel is acceptable. 3mm & 2mm - shifts on point, but completely binds up at torque. 1mm DS torques down properly with the ability to adjust preload, but it's then back to the same issue. Having said that, in the bike stand, you can bang the chain up and down no worries, and only around 1-2 times will the chain either drop or ride the teeth before popping into gear. Take it out on the road and it's roulette. For the most part, it's been fine, and the chain will jump back on after a few pedal strokes. However, it's not without a few cursory scratches to the cranks.

I've not got around to trying it yet, but my next port of call will be to try to remove the preload from the equation and attempt to use spacers to load and shift the crankset over into a decent chainline. Wonky Q factor or not, I'd rather not have the chain keep dropping mid-ride.
Keep us updated. I have chaindrop issues too and I cant replicate them for now. Not sure the issue is in the crankset, it shifts fine under the load and on a stand... Might consider tinkering in this direction.
September 03, 2025, 01:20:11 AM 		1
Re: Speeder Cycling SC-R55D I have clocked around 8k kilometers so I guess I can make a follow-up long-term review of my Speeder.

Starting with the caveats:
- saddle clamp bolt position makes it impossible to reach the front bolt with torque wrench and regular head - ended up tightening it by feel
- expander plug provided with the frame is not strong enough to keep handlebars and headset in place - issue solved with buying the longer, better manufactured plug from PRO.

That's pretty much all I've had! No sanding, facing, workarounds and other stuff you may expect from Chinese frame.

The bikes feels great and seems like future-proff allrounder - generous clearance, good geometry, super comfy, quite stiff where it is needed, pretty light and easy to work with. The biggest upgrade from the first setup were wheels and cockpit. I upgraded my older Elites to XMCS 26/33 58mm deep rims with steel spokes and went one size up with the same tires (30F 32R). Wide rims make ride even more comfortable and I will never look back at anything narrower for a road bike. HBR17 handlebars (130x380) from LC were installed mostly to increase re seems like a great upgrade from my 2nd gen The One handlebars (120x380) - 50g lighter, yet stiffer and cheaper. The only thing I don't like is a proprietary computer mount, longer reach could also be beneficial.
I ended up with the final weight of slightly below 7,4 kg with pedals, cages and mounts, which, considering the budget spent and frame size, is great. I will keep the bike for a foreseeable future as I don't see any reason to change it - it is very well made and performs great as a race bike.

PS: the Varia mount suggested by @tgarne fits like a glove - I bet the seatpost is interchangeable with Propel's.
May 14, 2026, 05:45:57 AM 		1