Technical Service Bulletins (TSB)

TSB #157 - Shimano™ EP8 Spindle Inspection in Conjunction with e*thirteen e*spec Cranks

TECHNICAL SERVICE BULLETIN #157

Shimano™ EP8 Spindle Inspection in Conjunction with e*thirteen e*spec Cranks

Provided By: e*thirteen Technical & Engineering Dept.
Direct Questions To: support@ethirteen.com

Download Full Technical Service Bulletin: TSB 157

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THIS TECHNICAL SERVICE BULLETIN IS INTENDED FOR:
e*thirteen OEM’s, assembly factories, distributors, dealers & end-users

PRODUCTS INCLUDED:

e*thirteen e*spec cranks used on Shimano™ EP8 (DU-EP800) Motors . 

Part Numbers & Descriptions 

CS3EPA-100 e*spec Plus Crank | Shimano™ EP8 | 165mm 
CS3EPA-101 e*spec Plus Crank | Shimano™ EP8 | 170mm 
CS3EPA-102 e*spec Plus Crank | Shimano™ EP8 | 175mm 
CS3EPA-103 e*spec Plus Crank | Shimano™ EP8 | 160mm 
CS3EPM-100 e*spec Plus Crank | 160mm | Shimano™ EP800 | 178Q 
CS3EPM-101 e*spec Plus Crank | 165mm | Shimano™ EP800 | 178Q 
CS3EPM-102 e*spec Plus Crank | 170mm | Shimano™ EP800 | 178Q
CS3EPM-111 e*spec Plus Crank | 165mm | Shimano™ EP800 | 177Q | Intense MX 
CS3ERM-101 e*spec Plus Crank | Shimano™ EP8 | 165mm | Q 177
CS3ERM-102 e*spec Plus Crank | Shimano™ EP8 | 165mm | Q 177 

 

PRODUCTS NOT INCLUDED:

e*thirteen e*spec cranks used on ShimanoE7000 or E8000 motors. 

Note: While identical e*thirteen e*spec crank arms are used across ShimanoE7000, E8000, and EP8 (DU-EP800) motors, spindle failures have only been reported to e*thirteen on EP8 (DU-EP800) motors -- therefore Shimano™ E7000 or E8000 motors are not included in this TSB.

 

BACKGROUND

  1. e*spec alloy and carbon cranks were developed specifically for Shimano™ ebike motors and sold via OEM and aftermarket channels in 2020 & 2021.
  2. March 2021, e*thirteen was made aware of Shimano™ EP8 spindle failures when used in conjunction with a number of different brands’ cranks, including the e*thirteen e*spec cranks.
  3. e*thirteen took immediate action to diagnose the issue with extensive 3rd party lab testing and metallurgical analysis to understand the root cause.
  4. e*thirteen’s analysis suggests that some Shimano™ EP8 spindles may have manufacturing defects which over time, can develop into cracks with use and exposure to the elements.
  5. This Technical Service Bulletin, #157, suggests a safety inspection to verify the motor spindle integrity when these cranks are used in conjunction with the EP8 motor.

CURRENT STATUS

Currently e*thirteen cranks pass and exceed all bicycle testing standards applicable to these components (ISO, EN, DIN) -- e*thirteen is confident that our cranks are not the source of the issue.

RECOMMENDED ACTION

e*thirteen recommends inspecting ShimanoEP8 motor spindles to ensure no cracks are present before riding any EP8 equipped bike again and in doing so have provided a step by step process for doing this with images and instructions below.

The inspection is done by removing the crank arms, thoroughly cleaning the spindle, and closely inspecting the area located around the hole drilled through the spindle in the splined location.

Please see written instructions with visuals below. If any help is needed, please contact the e*thirteen support team at support@ethirteen.com.

While e*thirteen does not foresee any issues with e*thirteen cranks, we stand behind our products and have warranty policies in place for our products. Please view our warranty policy and request form HERE.

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INSTRUCTIONS FOR ARM REMOVAL PROCEDURE

Note: Procedure is the same for left and right arms and should be performed on both

STEP 1 - LOOSEN PINCH BOLTS
Loosen counterclockwise both 5mm pinch bolts which attach the crank arm to the spindle. Ensure they are fully loose by alternating bolts until a gap between the head of the bolt and crank arm is visible.

1.jpg

 

STEP 2 - REMOVE PRELOAD CAP

Using a 5mm hex key, loosen counterclockwise and remove the preload cap.

2.jpg   3.jpg

 

STEP 3 - REMOVE ARMS AND CLEAN MOTOR SPINDLE WITH DEGREASER

 

STEP 4 - CLOSELY INSPECT THE EXPOSED SPINDLE, PAYING PARTICULAR ATTENTION TO THE AREA AROUND THE CROSS-DRILLED HOLE. INSPECT BOTH INSIDE AND OUTSIDE THE SPINDLE (Using your smartphone camera and zooming in can give additional clarity)

INSIDE VIEW 

Text_on_Images-02.jpg Text_on_Images-07.jpg

OUTSIDE VIEW 
Note: Trough/groove marks pictured on the wide spline tooth and elsewhere on the spindle are manufacturing marks present from the factory. These marks are inconsistent, and may not necessarily be present on all spindles!

Text_on_Images-01.jpg Text_on_Images-03.jpg

 

STEP 5 - REINSTALL OR CONTACT THE APPROPRIATE PARTY FOR REPLACEMENT

  • If no crack is present, move onto the arm install procedure below.
  • If crack is present or you are unsure, contact your Bicycle Manufacturer or local Shimano Service Center for further instructions.

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ARM INSTALL PROCEDURE - Procedure is the same for left and right arms and should be performed on both.

STEP 1 - VERIFY PRELOAD CAPS HAVE A PRE-APPLIED THREADLOCKER PATCH.
Note: Preload bolts may appear visually different than shown in photo.

Screen_Shot_2021-10-13_at_8.26.00_PM.png

If threadlock patch is present, move on to step 2. If there is no threadlocker patch, move to the next point.

If preload cap has no threadlock patch pre applied, Clean inner and outer threads and apply 1 drop of Loctite 242 or similar light/medium threadlocker compound to the threads on the preload cap.

Alternatively, you can contact e*thirteen to be supplied with a preload caps with pre applied threadlocker.

STEP 2 - INSTALL ARMS ONTO SPINDLE
Note left vs right arms and slide onto the spindle and press them firmly in place.

STEP 3 - REINSTALL PRELOAD CAP AND TORQUE FASTENERS TO SPEC

Install and tighten preload cap to 2Nm

3.jpg Text_on_Images-05.jpg

Using a torque wrench, tighten crankarm pinch bolts using an alternating sequence until both bolts reach 14Nm. You will do this (2) times starting with the inside bolt (a) then the outside bolt (b), then repeat. Sequence = (a)(b)(a)(b)

Text_on_Images-04.jpg Text_on_Images-06.jpg


STEP 4 - REPEAT PROCEDURE ON OTHER ARM

STEP 5 - RECHECK PINCHBOLT TIGHTNESS AFTER 1-2 RIDES TO ENSURE 14Nm TORQUE ON PINCHBOLTS

 

 

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About e*thirteen
When the cycling world calls for reliable performance solutions, e*thirteen responds.
A global organization of expert designers, engineers, developers, manufactures, marketers, sales teams, and customer service players, e*thirteen is dedicated to building bold ,“best in class“ bicycle solutions for today and tomorrow’s riders. After 20 years of building unique solutions across a variety of industry needs, e*thirteen is a leader providing bike retailers and riders high performing products with one goal – To stay true to the promise of fearless engineering for the best possible and most reliable ride.

 

 

 

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/hc/en-us/articles/4408312390043-TSB-157-Shimano-EP8-Spindle-Inspection-in-Conjunction-with-e-thirteen-e-spec-Cranks
TSB #156 - e*spec Shimano™ alloy crank tech update

TECHNICAL SERVICE BULLETIN #156.2

e*spec Shimano™ alloy crank tech update

Product(s) included: e*thirteen e*spec Shimano EP8 alloy cranks. 

 

Abstract

e*spec Shimano EP8/EP800 alloy cranks were developed specifically for Shimano™ ebike motors and sold via OEM and aftermarket channels in 2020 & 2021. This TSB highlights install torque updates and additional measures we have taken to address the issue highlighted below.

 

Issue

We have had reports of crank arm preload caps from affected cranks loosening up and falling off. If crank pinch bolts, which fix the arm to the axle, are not tightened to spec or properly tightened, it is possible that lack of cap and incorrect installation torque and/or install technique could lead to the arm loosening.

 

This situation has been misinterpreted by some to mean there is a failure of one or more system components. That is not the case, but all cranks should be checked for proper tightness before riding, and initial installations procedures should be updated. 

 

Solution

 

  • Threadlocker patch:
    • Early production preload caps did not incorporate a threadlocker patch to prevent loosening in the case that the cap was not properly tightened upon install. A threadlocker patch is now being used on all preload caps. Customers with caps lacking threadlocker patch can use light/medium strength threadlocker such as Loctite 222 or Loctite 242; or contact e*thirteen support for a replacement cap. 

 

  • Torque specification updates:
    • Original torque specification: Preload cap: 1Nm / Pinch bolts: 12-14Nm.*
    • Updated torque spec: Preload cap 2Nm / Pinch bolts: 14Nm.*

*Correct tightening procedure is critical. Please reference directions below

 

  • Inner seal removal: 
    • The seal found at the inner face of the crank should be removed from the assembly. This avoids potential false torque readings and provides an additional 1mm of interface between the crank and spindle.
    • Note: Removing inner seal must be done in conjunction with using the e*thirteen preload cap. Using non-e*thirteen preload caps may result in the cap bottoming out on the spindle before preloading the crank. 

 

image_2021_03_10T04_07_22_069Z.pngimage_2021_03_10T04_08_49_926Z.png

 

 

Arm Tightening Procedure 

*Note: Procedure is the same for left and right arms and should be performed on both.*

 

  • Step 1 - Verify if preload cap needs loctite applied, and apply if necessary.
    • Loosen counterclockwise both 5mm pinch bolts which attach the crank arm to the spindle. Ensure they are fully loose by alternating bolts until a gap between the head of the bolt and crank arm is visible. 

1.jpg

  • Step 2 - Identify if preload caps have a pre-applied threadlocker  patch and apply if necessary.
    • 2a - Using a 5mm hex key, loosen counterclockwise and remove the preload cap.

2.jpg

IMG_3633.JPG

    • 2b - If threadlock patch is present, move on to step 3. If there is no threadlocker patch, move onto point 2c.
    • 2c - If preload cap has no threadlock patch pre applied:
      • Clean inner and outer threads and apply 1 drop of Loctite 242 or similar light/medium threadlocker compound to the threads on the preload cap
      • or, Contact e*thirteen to be supplied with a preload caps with pre applied threadlocker

 

  • Step 3 - Reinstall preload cap and torque fasteners to spec. 
    • 3a - Install and tighten preload cap to 2nm

3.jpg4.jpg


  • 3b - Using a torque wrench, tighten crankarm pinch bolts using an alternating sequence until both bolts reach 14nm. You will do this (2) times starting with the inside bolt (a) then the outside bolt (b), then repeat. Sequence = (a)(b)(a)(b)


6.jpg5.jpg

  • Step 4 - Repeat procedure on other arm. 
  • Step 5 - Recheck pinch bolt tightness after 1-2 rides to ensure 14nm torque on pinch bolts. 

 

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/hc/en-us/articles/360057823952-TSB-156-e-spec-Shimano-alloy-crank-tech-update
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