Don't be limited by stock gearing
You can have LOWER GEARS 
Any way you want them for steep climbs

for high altitude

for easier climbing

for maximum efficiency

a necessity for loaded touring

great for recumbents, trikes and hand cycles


MOUNTAIN TAMER QUADTM  sold out
  • Adds a 16 thru 21 tooth chainring in the 4th position
  • Used with standard triple chainring
  • Very light weight - 59 grams with 16 T
  • Allows wide range of gearing
  • with optimal gear spacing
  • Threaded chainrings

All Mountain TamerTM adapters work with cranks having
standard  74mm bolt circle  (43.4mm hole spacing) 5 bolt pattern only.
They are not compatible with 4 arm cranks or cranks with 68mm BCD.
Check with Andel Enterprise Co. Ltd. http://www.andel.com.tw/ for 74mm BCD cranks.
or search on eBay. Use 'crank 74 110' or 'crank 74 130' as the search string.

CHAINRINGS

Threaded - 16-17 teeth  16T,17T sold out

Threaded - 18-21 teeth $8.95 ea.     20T sold out

110mm 34 teeth inner  check for price

74mm 24, 26, 28, 30 teeth triple - inquire

any other standard chain rings - inquire
Also check the Bargin/Closeouts
 for great deals on other chainrings


The threaded chainrings are Normandy-Mailard or Sachs-Mailard cogs.  They are the 'MR' or 'GY' position.
The only site I found was http://the-bici.com

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Bottom Bracket Cup Spacers $2.75 ea.
Allows fine adjustment of the chainline by shimming the BB cup away from the frame.
    • 1.0mm
    • 2.0mm
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Chainring Bolt Spacers $4.95 set of 5
Allows fine adjustment of the chainring by shimming the adapter away from the crank
or may be used to adjust the spacing of the middle or outer chainring.
    • 0.6mm
    • 1.2mm
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Chainring Bolts $7.49 set of 5

           8mm dia. x .75mm x 8mm long
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The Mountain Tamer and Gorilla products are no longer being manufactured.
The remaining inventory will be kept available as long as possible.
 
Mountain Tamer made in U.S.A - Since 1987
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Ordering Information

Sorry I don't have a shopping cart.

Most people have questions and I want to make sure you get answers. 

To order:  email for prompt personal service
If you wish to speak in person, I will call you back upon request.
Shipping and handling is usually $7.50 for small items, but may vary.
Priority Mail  available. Request price information.

PayPal, money order, or check accepted

No other address will be accepted.
How do I use PayPal?

International Orders
Due to increased regulations and shipping costs, we are no longer shipping internationally.
If you are in the EU, Gorilla Brake Beefers are available here.

NTU ENTERPRISES, LLC
Albuquerque, NM 87123


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Last update 1/7/2026

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