Chinese Carbon MTB > 29+ & 27+

Ican P8 Build Questions

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3GGG:
Hi All

My last MTB was a new Proflex Beast in the late 90's. I am keen to get back into mountain biking and will be building up a P8 as a 29er.

My build won't be anything over the top but would love some advice on parts selection as I have never built a bike and parts have changed a lot in my 20 year hiatus.

I am looking at this groupsethttps://www.ebay.com.au/i/122225659721?chn=ps&ul_ref=https%253A%252F%252Frover.ebay.com%252Frover%252F1%252F705-139619-5960-0%252F2%253Fmpre%253Dhttps%25253A%25252F%25252Fwww.ebay.com.au%25252Fi%25252F122225659721%25253Fchn%25253Dps%2526itemid%253D122225659721%2526targetid%253D91828837057%2526device%253Dm%2526adtype%253Dpla%2526googleloc%253D9070952%2526poi%253D%2526campaignid%253D184043497%2526adgroupid%253D8467825417%2526rlsatarget%253Dpla-91828837057%2526abcId%253D578876%2526merchantid%253D119060590%2526gclid%253DCjwKCAjwkrrbBRB9EiwAhlN8_EWO1Z_MxVcSz8vL-7bUt3XYkWzWIEo542sGd9QYZp3hA-U8a-rsDBoCiekQAvD_BwE%2526srcrot%253D705-139619-5960-0%2526rvr_id%253D1628415125692%2526rvr_ts%253D28e035241650ac196ab4936afff9da6e  but am concerned it won't be compatible with the frame. Any help would be appreciated. Cheers

Janz99:
Im new to building mountain bikes as well, so hopefully someone else can confirm this.  I have a P8 and when I purchased my crank set it was a boost spacing specific.  I don't see that mentioned in the ebay add you linked?

Here is the crank set that I ordered:
https://www.jensonusa.com/Shimano-XT-FC-M8000-Boost-Crank-Arms

3GGG:
Yeah boost is all new to me.

I assume I will need boost specific hubs and front fork.

The cranks however is it just the bottom bracket or is it a specific crank also?

acedeuce802:
Boost rear hub is mandatory, boost front hub/fork is suggested.  You could technically do a non-boost fork and front hub, but the axle to crown may not match, you wouldn't have the tire clearance for 27.5+, and then you'd have mismatched front/rear wheels.  Short answer, boost front/rear/fork.

The BB is generic BSA.  For Shimano, it's the cranks that dictate whether they are boost or non-boost.  FYI for Sram, it's just the chainring that dictates boost, at least for the direct mount.

This may help understand crank compatibility: https://www.oneupcomponents.com/pages/understanding-chainline-for-optimal-1x-conversions-boost-and-non-boost

3GGG:
Excellent thank you for the link. Got it now

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