SLX Crank Arms

SLX Crank Arms


Regular price Sale price$102.99
Crank Arm Length
  • Low stock - 2 items left
  • Inventory on the way
  • Free shipping on all orders $49+


  • Series: SLX M7100
  • Speeds: 12-speed
  • Material: Aluminum
  • P.C.D: Direct 
  • Bottom bracket not included
  • Chainring not included

Shimano SLX FC-M7100 Crank Arms

  • Hub Spacing:  Non-Boost (135/142mm) & Boost (141/148mm)
  • Chainline: 52mm
  • Q-factor: 172mm
  • Average weight (32t): 631 grams

Shimano SLX FC-M7120 Crank Arms

  • Hub Spacing: Boost (141/148mm)
  • Chainline: 55mm
  • Q-factor: 178mm
  • Average weight (32t): 638 grams

Shimano SLX FC-M7130 Crank Arms

  • Hub Spacing:  Superboost (157mm)
  • Chainline: 56.5mm
  • Q-factor: 181mm
  • Average weight (32t): 647 grams


The Shimano SLX Crank Arms are compatible with the following:

  • Chain: Shimano HG 12-speed chains
  • Chainring: Shimano direct mount chainrings:  CRM75, CRM85, CRM95
  • Bottom Bracket: Shimano Hollowtech II Bottom Brackets
  • Pedal: All 9/16" pedals

Please reach out to us with any questions you may have on anything we sell. We want to make sure you get the right part the first time. Our lifelong riders at Thunder Mountain Bikes are knowledgeable and would love to talk to you!


We currently offer both economy and expedited shipping options though FedEX and USPS. 

Orders totaling over $49 are eligible to ship for free via an economy ground option of our choice. 

If you're in need of something super-quick, please contact us directly. We may be able to overnight your order with an additional fee and depending on your location. 


Should there be an issue with the item you bought, or you no longer need your purchase, we will be happy to set up a return.

Returns or exchange requests for New or Used Bikes must be requested by emailing us at within fifteen (15) days from the date of delivery. Bikes must be in un-ridden condition. Custom-built bikes may not be returned. Returned bikes have a $200 restocking fee and the customer pays for return shipping.

Returns for most other items may be requested within sixty (60) days of the delivery date. All returned items must be received in new, unused, and uninstalled condition, with the original tags and labels attached and in the original packaging. We cannot accept returns on any items installed or show wear of any kind. 

Clearance and open-box items may not be returned. 


To request a return, please log in to your customer account by clicking the  customer account icon  Profile icon in the top right of any page or visit

1. In the Email field, enter your email address and click Continue.

2. In your email account, open the email sent from our store and copy the six-digit verification code included in the email.

3. Go back to the online store and enter a six-digit verification code to log in.

4. Find and click on the order that you want to submit a return for.

5. If your order has more than one item, select only the items you want to return.

6. Select a return reason and add a note for the store if needed.

7. Click Request Return.

Once your return request is approved, you will receive an email with shipping instructions and a return shipping label. 


We will process your return after we receive your returned item(s) and inspect the condition. Please allow at least seven (7) days from the receipt of your item to process your refund. We will notify you by email when your return has been processed.


If you receive defective or damaged products or if we sent you the wrong products, please contact us using the phone number or email below.


If you have any questions concerning our return policy, please contact us at:

(928) 282-1106   |

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Customer Reviews

Based on 9 reviews
Frank Ledesma
Fast Service

I ordered bottom bracket and cranks on 4/24 and received them within 4 business days. Pricing was very competitive. Will definitely return when I'm in the market for more parts.


Great price, good cranks. Needs a special tool.

Gregg Stazetski
Nice cranks

Can't beat the price and quality on SLX.

John Asuncion
Proven Japanese quality and engineering!

As a return customer to TMB, Ian, as usual, very helpful and offered his expertise/guidance on the proper cranks on my enduro build. I wanted 165mm length and he recommended 7120 model for the ideal chainline for my Boost frame. Fits perfectly and feels great! I wasn't very particular to drivetrain brands before, now prefer Shimano!

Great upgrade from 170mm Deore cranks

I'm 5'6" and wanted to swap my 170mm Deore cranks for 165mm, and these SLX fit the bill as I couldn't find Deore in 165mm. I definitely experience fewer pedal strikes with 5mm shorter cranks, and SLX is a notch higher in Shimano's lineup than Deore, which usually translates into lower weight.

I called to verify fitment before ordering, and spoke with an actual human. Very friendly service and super fast shipping. I'll definitely be a returning customer.