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Shun Alloy 104 PCD 4-Arm Freewheeling Cranks - 170 mm - Silver

£54.99
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Questions & Answers (6) Q & A
Details
We stock this for tandems (although there may well be other applications), this can only be used on tandems with hub gears and straight through drive, allows the rider (front or rear or both) to independently freewheel. Requires a very long bottom bracket, when fitted to a Thorn Raven Twin tandem (these use 73mm bottom bracket shells) the only bracket we've found to use is a cup and cone type. Bracket, item # 22175, cups item # 22176. Please note, this adaption is a great low cost improvised solution to allow people who may otherwise not still be able to cycle to get out on a bike.

- Freewheeling crank is on the RIGHT side - only suitable for 'Through-drive' (timing chain on right side of bike). Therefore best suited to tandems running hub gears.
- Fits JIS taper bottom brackets
Specification
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Questions & Answers (6)
If Fitted This Way The Stoker Cannot Freewheel
By
22 Nov 2016
Hi
Thanks for your reply. I think if you fit it as the stokers chainset driving backwards as you descibe the stoker will not be able to free wheel if the pilot is pedaling. If you fit it on the pilot right it would be difficult if not impossible to get a chain line back to the rear wheel. I think that the only option is to fit it to the left front with the stoker driving forward. The only problem is the threads on the crank which are not to difficult to sort. Please see http://www.akweb.org.uk/northern/part10.html which shows how I did it with a Thorn tandem and parts supplied by SJSC
SJS Customer Service:
Hi,

If you're looking to allow the stoker to freewheel, then it would be possible to fit two chainrings to this crankset. It is not a neat solution as spacers are required but this way should allow the stoker to freewheel without causing too many chainline issues.

Thanks.
Why Will It Not Work On The Left?
By
21 Nov 2016
Hi, Robin helped me put a crank freewheel on the left of my tandem. It works fine though I had to have the crank helicoiled for a left hand thread.

How did you actually get it to work on the right? To do this the stoker has to drive forward to the freewheeling pilot's crank on the right. But if you do this how do you get a clean chain line to the Rohloff? Seems impossible to me, has anyone actually done it and do you have any pics? Thanks Ken
SJS Customer Service:
Hi,

The way the freewheel is set up means that it can only be fitted on the right hand side. This chainset is normally fitted as the pilots chainset and the stoker chainset is usually one that can accept two chainrings allowing for suitable chainline for both on the right hand side.

Thanks.
Just Wondering Why These Can Only Be Used For Hub Gears?
By
02 Dec 2015
SJS Customer Service:
Hi,

We're only referring to tandems with hub gears, as this normally allows for a through drive system. A solo bike normally has a much higher quality freewheel as part of the hub and only the one set of cranks so does not normally require a second freewheel. That said, there is nothing stopping you fitting these to a normal bike if you wanted to.

Thanks.
Can These Cranks Be Made Up As A Tripple Chain Ring
By
25 Feb 2015
SJS Customer Service:
Hi

This can only be used on a double or single chainring set up, unfortunately there is no way that it can be used for a triple chainring set up.

Regards, Jamie
Shun Freewheelng Crank
By
07 Jan 2015
Is this only available for right side installation, our tandem has left side timing cranks so would not work unless made for that side.

Thanks
Ed

SJS Customer Service:
Hi,

Unfortunately these freewheeling cranks will only work on the right hand side of the bike.

Thanks.
What Is The Specification Of The Freewheel Used?
By
15 Jun 2014
BCD of the bolts?
What bolts/thread ?
Do you sell the freewhells separately too.
I need this crank + 3 freewheels
SJS Customer Service:
Hi,

These cranks take 104mm BCD chainrings. Any standard chainring bolts can be used with these cranks. Unfortunately the freewheels are not available separately.

Thanks.