Poseidon Redwood: Crankset/BB Questions

5 replies · 2,524 views

Redwood
1 posts
#1Nov 9, 2020, 12:53 PM
Hey everyone I'm completely new to this forum and have some questions about my new gravel bike I bought second hand. It's a 2020 Poseidon Redwood (medium) and is only 2 months old; however, the left crank arm fell off during a ride one day and looks like the threads are stripped on the arm and the spindle. It has a square taper style bb and I'm pretty much confused on what to look for to replace the crankset and bottom bracket. I stopped by a couple LBS's and left confused from each one. The first one told me that the spindle was a specific size in order to keep the chainline and that they didn't have anything that could fit. The second shop told me that they also didn't have anything available either. So I'm trying to source my own parts now and I'm wondering if anyone can give me some insight or suggest some upgrades here? Here's the spec list from Poseidon's website:

Specs:
- Frame: 6061 Double Butted Hydroformed Aluminum
- Fork: 6061 Aluminum Fork – Tapered Steer 1 1/8" – 1 1/2"
- Shifters: MicroShift Advent X 10 Speed
- Handlebars: Poseidon Adventure Bars with 24 Degree Flare
- Brake Levers: MicroShift Advent X
- Rear Derailleur: MicroShift Advent X 10 Speed with Clutch
- Brakes: Tektro MD-C550 Mechanical Flat Mount Brake Calipers
- Disc Rotor: Tektro 160mm F&R
- Crank: Prowheel 38t Narrow Wide Crank
- Chain: KMC 10 Speed
- Bottom Bracket: 73mm English Threaded Square Taper
- Cassette: Microshift 11-48T Advent X 10 Speed
- Bottle Cage Boss: 2 on the size XXS, 3 on the size XS, Small, & Medium, 4 on the sizes Large & X-Large
- Seat Post: Promax Alloy 31.6
- Saddle: Poseidon X alloy rails
- Pedals: Platform Pedals
- Tires: Kenda Kadre 27.5 x 2.35 Clincher tires
- Wheels: Poseidon Alloy Tubeless Compatible 27.5” Wheels
  12x100 Thru axle front & 12x142 Thru axle rear
- You will find multiple locations on the frame to mount an assortment of accessories in the front and rear.
0
sincos
23 posts
#2Nov 10, 2020, 8:11 PM
Honestly I don't know what this means: "looks like the threads are stripped on the arm and the spindle" What threads on which arm? But no matter: at 2 months this is a warranty issue. Take it back.
0
ljsmith
762 posts
#3Nov 11, 2020, 2:51 PM
The best thing to do is scrap your square taper crank and bottom bracket and get a modern external bottom bracket and crankset. I’m not sure why a bike store would not recommend this. How much you are willing to spend and brand preference will determine what to get. You will also need tools to remove your current bottom bracket and install the new one.
1
Angstrom
181 posts
#4Nov 11, 2020, 8:25 PM
If you want to keep that crankset, 73mm square taper BBs are available and inexpensive(unless you get the White Industries version);-)

https://www.modernbike.com/bottom-brackets+shell-widthis73+frame-interfaceequalsenglish
Your other option is to change the bottom bracket to an external version and get a different new or used crankset.
0
Angstrom
181 posts
#5Nov 11, 2020, 8:38 PM
Contact Poseidon and ask for the exact dimensions/specifications for the stock BB.

Warranty usually only applies to the original owner, but they should be willing to help you.

I assume the threads in the BB axle are stripped? Is the crank bolt also stripped? You may need new bolts if they don’t come with the BB.

0
Angstrom
181 posts
#6Nov 11, 2020, 8:43 PM
More than you want to spend. ;-)
http://www.whiteind.com/bottom-bracket
There are two important dimensions. You already know that the width of the BB—the distance between the cups—is 73mm. You also need the length of the spindle(axle).

0

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