Shun Alloy 104 BCD 4-Arm Freewheeling Cranks - 170 mm - Silver
£64.99
was
£64.99
was
Manufacturer :
SJS Cycles part number :
Manufacturer part number :
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, it takes 9/16" pedals.
- Single or double chainring set up, not suitable for triple.
- Weight: 760g
- 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, it takes 9/16" pedals.
- Single or double chainring set up, not suitable for triple.
- Weight: 760g
Specification
Downloads
Download File
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Product Reviews (3)
Overall Product Rating 4 / 5
Has refused to stop working!
By Rik Campos
09 Jun 2023
4 / 5
I recommend this product
ConsReplacement crank arms for this unit would be great
ProsWorks as it should!
Having to place my order for a second one of these as my first 7 yrs old was vandalized.
its ok
By Theodore
01 Mar 2023
3 / 5
I recommend this product
Consit wables quite a bit
Prosenables my motor to speen freely without me pedaling
when it arrived i installed it and noticed that it was a little bit wabley but now it has gotten worse to the point that the chain doesnt stay on if you go to fast i think its just my unit but i am not sure becase i use it on an electric bike so i dont really know
By Anonymous
05 Mar 2021
5 / 5
I recommend this product
ConsNone
ProsEnables stoker to rest and gives her time to get her feet in the toeclips
We bought a new Thorn Raven Twin in 2013 after my wife broke her hip which still means that she likes a break from pedalling from time to time. The Shun cranks have been great. The added bonus is that when bystanders shout
Questions & Answers (8)
Is the thread for the freewheel a standard 1.37" 24 TPI?
By Bob Bending
04 Mar 2023
SJS Customer Service:
Yes the chain set is a standard Freewheel thread, but uses it's own freewheel allowing attachment of the spider. SK 06/03/23
ss-7002-f4
By kris
01 Mar 2019
Hello
i'm interested in a double freewheel for tandem.
Do you have more than 2 of these in stock? Do you send products to belgium?
thanks
Kris
i'm interested in a double freewheel for tandem.
Do you have more than 2 of these in stock? Do you send products to belgium?
thanks
Kris
SJS Customer Service:
We currently have 2 in stock, with a large delivery due in April. Please contact our sales team directly if you wish to pre order some!
Thanks - 01/03/19
Thanks - 01/03/19
26T chainwheel to match?
By Mick
19 May 2018
Hi, I'm wanting to fit this to an early (steel framed) Hase Pino to replace the original stoker freewheel crank. Do you have a 26T chainring that would fit? Incidentally, is it always recommended that the pilot/stoker drive ratio be 1:1 or might using, say, a 28 and 26 in combination be ok? Cheers
SJS Customer Service:
Hi there,
The BCD is 104mm, the smallest chainring we do is 30t so you would need to source a 26t or change both to slightly larger sizes.
Thanks
The BCD is 104mm, the smallest chainring we do is 30t so you would need to source a 26t or change both to slightly larger sizes.
Thanks
Is this freewheel crankset compatible with this kiddy crank?
By Stan
22 Mar 2018
See https://www.sjscycles.co.uk/componentstandem-specific-parts/kiddy-crank-seat-tube-attachment-block-286mm-black/
The tandem in question will have a Rohloff fitted to it and is a full size adult-adult tandem.
The tandem in question will have a Rohloff fitted to it and is a full size adult-adult tandem.
SJS Customer Service:
Hi there,
Yes this will be suitable, if you change the BB on the Kiddy crank attachment.
Thanks
Yes this will be suitable, if you change the BB on the Kiddy crank attachment.
Thanks
Crank shortening
By David Schofield
06 Mar 2018
Hi
I want to get these shortened to 120 or 125mm
Please can you tell me the crank thickness at say 125mm.
Many thanks
I want to get these shortened to 120 or 125mm
Please can you tell me the crank thickness at say 125mm.
Many thanks
SJS Customer Service:
Hi
Thank you for your enquiry, at the 125mm point the crank thickness is approximately 13.5mm.
Kind Regards
Thank you for your enquiry, at the 125mm point the crank thickness is approximately 13.5mm.
Kind Regards
Use with Schwinn Tango tandem
By Tim Peiffer
14 Nov 2017
Tandem has both chainwheel sets on drive side, 7 speed freewheel only no front derailleur. Your description reads "only for use with hub gears" . does this mean internal geared hub or can this be used with a rear derailleur mech?
will crank spider accept two chainrings?
will crank spider accept two chainrings?
SJS Customer Service:
Hello,
This would be only suitable for an internal geared hub.
Thanks.
This would be only suitable for an internal geared hub.
Thanks.
If Fitted This Way The Stoker Cannot Freewheel
By Ken Reed
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
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.
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 Ken Reed
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
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.
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.