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Re: Gr048 with Tansmission? I've built a few gravel bikes with the Transmission system with the CFR-505 from Carbonda.
All the riders are extremely happy!
I'm a bit jealous now, still riding the old Eagle AXS on my gravel  ::)

The chainline of the SRAM gravel/road crankset (wide) is 47.5mm, which may cause chain rub on a couple of small sprockets if your chainstay length is on the short side (420-430mm).

I contacted SRAM to see if I could safely widen the chainline a bit. A colleague of the person who responded to me had the same issue with a mullet setup. I mentioned that the chain rub would cause some noise and lateral chain wear, but they said he was managing it fine...

I escalated the issue and eventually got someone who, after some back and forth, confirmed that SRAM has 47.5mm max only.
If I remember well, they didn't say it directly, but implied that it would be okay to use a wider chainline if found, as MTB setups allow for much more.
I added a 1mm shim on the right side, which solved the rub issue.

In addition, the app from SRAM to know the chain length, and the position of A/B setup key is not reliable.
It stops at around 38T, so add one link per additional teeth.
And it puts the setup key to A while it should generally tell B. Test both options and see which one works better.

Now, I'm about to build another one, and this time I'll try with XX1-Quarq/104BCD crankset with a 49mm chainline
May 27, 2024, 04:10:48 AM 		1
Re: Kids Size Chinese Carbon MTBs? @Chris948

What wheels did you use for your build pictured?  Looks like a mullet setup w/ 26" front wheel? 

I'm looking for a small 26er for my 9 year old daughter, similar to the DIY carbon option.  The weight weenie aspect is easy enough on these bikes other than the wheels, anybody find any cheap carbon wheels in 26"?  The kids are so light that I'm not that worried about them being 'strong' enough (most things will be).
August 21, 2024, 08:41:32 AM 		1