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Replacement Bolt & Locking Knob for Surco 51953 Bike Rack
(15 reviews)
Price: $29.16
In Stock
Surco Products
Replacement Bolt & Locking Knob for Surco 51953 Bike Rack
Part Number: SPN-104
In Stock
$29.16
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- Reviews (15)
- Q & A (0)
- Photos
Surco Products Accessories and Parts - SPN-104
- Hitch Bike Rack
- Knobs
- Surco Products
Replacement locking knob for 4 Bike Carrier Hitch Mounted Swinging Bike Rack (51953).
Features:
- Replaces a worn or lost locking knob on your Surco 4 bike, hitch-mounted, swinging bike rack
- Fits Surco part number 51953
- Made in the USA
SPN-104 Replacement Bolt and Locking Knob for Surco 51953 4 Bike Swinging Carrier
Customer Satisfaction Score:
87% were satisfied with this product
13% of customers were not satisfied
- Wrong item was ordered
Ratings & Reviews
4.5
15 reviews
by:
Rogelio
04/21/2026
Had it for only a few months and it has already broken. The pin that allows you to unscrew it has popped out and now it’s stuck on my car. I’m going to have to cut it off to remove it.
by:
Alma
08/22/2025
This is not the correct product. I need the piece that screws the arm into the piece attached to the the spare tire.
Lazer S.
9/9/2025
Your picture doesn't look anything like the Surco 51953 Swing Away bike rack this is designed for, so I am not surprised this didn't fit. This is basically a 3/8 inch diameter bolt and it has 16 threads per inch. What are you trying to use this with? Like specific brand or part number.
by:
Teresa
07/02/2022
The Surco spare tire bike rake works well on my Toyota RAV4. I had a problem getting the knob to unlock and submitted a question to etrailer. They followed up immediately and helped me. It turned out I didn't have the key in the exact right position for unlocking. I ordered the replacement bolt before I figured it out. The bolt/knob arrived in a couple days. I decided to keep it as a spare in case it is needed in the future.
by:
Stephen
09/09/2024
Excellent customer service and quick shipping
by:
Rich
11/27/2020
Fit perfectly on my older BT300 and works well. Very pleased.
by:
Richard
08/13/2026
by:
Mike
04/02/2021
by:
Joseph
08/12/2025
by:
Norbert
04/03/2025
by:
Jim
07/18/2023
by:
Robert
01/21/2023
by:
Dave
08/23/2021
by:
John
08/24/2023
by:
John
06/01/2021
by:
Don
05/02/2024
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See what our Experts say about this Surco Products Accessories and Parts
- Replacement Locking Knob Needed For A Bauer Bike Rack Hey Chris, We have a few other options to choose from but without knowing the dimensions of original bolt I can't confirm fitment. Surco Products # SPN-104 - 3-1/2" long x 3/8" in diameter with 16 threads per inch Thule # TH93NW - 3-7/16" long bolt that has a 3/8" diameter and 24 threads per inch (fine thread) Hollywood Racks # HLY59RR - 3" long x 5/16" diameter bolt with 18 threads per inch If you can get me the dimensions of the original bolt I can see if we might have something...
view full answer... - Replacement Bolt And Knob Option For An Older Bauer Bicycle RackI can not confirm or deny if we have any replacement knobs for your Bauer bicycle rack without any information on the rack, however due to the age I am going to assume probably not. We do have the Replacement Bolt & Locking Knob for Surco 51953 Bike Rack # SPN-104 which sounds like what you're looking for. This is designed for the 4 Bike Hitch Mounted Swing Away Rack, however if the knob and bolt you're replacing is 3/8" in diameter, has 16 threads per inch, and is 3-1/2" long, then...
view full answer... - Replacement Bike Rack Key Stamped 004I am not sure what bike rack you are referring to but the key marked 003 you were looking at Replacement Key for Surco Bike Racks - Key #003 - Qty 1 item # SPN-100-003 only fits Surco Bike racks where the cylinder is marked 003. It will not fit cylinders marked 004. This is the only Surco replacement key we offer. We do offer another replacement key for an 004 lock cylinder it is the Replacement Key for Thule Racks and Carriers - N004 item # THKEYN004. This will only fit Thule racks and...
view full answer... - Is There a Replacement Key Number 034 Available For A Surco Bike Rack?The Replacement Key for Surco Bike Racks # SPN-100-003 you're looking at is the only replacement key we offer from Surco. You may be able to find a replacement key by itself from Surco or elsewhere, but other than that you're going to have to cut off your existing lock and replace it with the Replacement Bolt & Locking Knob for Surco 51953 Bike Rack # SPN-104.
view full answer... - What Is Thread Size Of Bolt On Surco Replacement Bolt & Locking KnobI called my contact at Surco and they told me the Replacement Bolt & Locking Knob, part # SPN-104 is a 3/8 inch diameter bolt and it has 16 threads per inch. This is a replacement knob for a Surco Bike Rack, 51953.
view full answer... - Replacement Locking Knob for Surco Spare Tire Mount Bike RackYes. I did some checking and replacement knob # SPN-104 also fits the Surco spare tire bike rack # BT300. The Surco bike racks all have similar top plates that take the same knob.
view full answer... - How To Use the Surco Locking Bike Rack KnobWhen the # SPN-104 is unlocked, the knob should be gripping the inner bolt to allow the knob to turn and loosen. Occasionally you'll think the lock is all of the way turned but it hasn't engaged and it appears that the knob is not working; you'll want to try to turn the key just a bit more and also make sure the knob is installed when confirming it works. If you still are having issues let me know and I can get some other things to try.
view full answer...
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Info for this part was:
Expert Research:
Michael H
Expert Research:
Jeffrey L
Written by:
Laura H
Updated by:
Wilson B
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Kate F.
4/23/2026
Sounds like it may have cross threaded a bit. Have you tried to take pressure off of it and then unscrew?