Thorn 104/64 PCD Triple Crankset MK2 - Black

Hi please clarify what length bb spindle is required to give 57mm chainline with single chainring in outer position?

Do you think this is ok with a Bafang mid drive for use with a shorter rider. Bafang only supply 170? YEs I know the right side will look a wee bit cluttered!?

I'm thinking of using this on my Thorn audax mk3 to set it up for touring/light gravel riding. I currently have a Shimano 105 9spd triple setup with Flight Deck STI shifters. Will the chainring spacing on these work with those shifters and front derailleur? And is there a bottom bracket that you would currently recommend? Thanks!

https://www.rohloff-au.com/new-products

Thanks!

If I install Single chainring at outer position. Which Thron chainring shall I order?

I am resurrecting an older Raleigh Firefly MTB, and I think I need to go longer Crank arms. 34" inseam, I'm reckoning 185mm crank length. Would you know what else I would need to swap on the Firefly, or could I just order these and swap over?

Will this set fit the Gt Fury Expert 2019 as I need to replace the original Raceface Chester ones as the arm has bent and I can’t get the original replacement anymore

which crank extractor tool should I use with this? I have bought a Parktool CCP44 tool but think it is the wrong thing

Thank you for your response to my query on using Shimano Alivio FC-M430-8 chainrings, nuts & bolts with this.

Yes, I want to end up with a double chainset. My existing guard is fitted instead of an outer chainring, so I have 32T in the inner position, 44T in the middle position, and chainguard in the outer position. I want to end up with I have 22T in the inner position, 32T in the middle position, and chainguard in the outer position.

Thanks again for your help.

I want to change my setup from 175mm cranks with 44/32 (and chainguard in the outer position) to 150mm cranks with to 32/22 (keeping exisitng chainguard).

Would the following chainrings, nuts & bolts work with the Thorn 104/64 PCD Triple Crankset MK2 150mm (SJS Cycles part number 31813L150)
* Shimano FC-M540 Double Gear Fixing Bolt & Nut Set - M8 x 8.5mm - Y1FM98020 (SJS Cycles part number 17954)
* Shimano FC-M540 Inner Chainring Fixing Bolts - M8 x 8.5mm - Y1FM98030 (SJS Cycles part number 17955)
* Shimano Alivio FC-M430-8 104mm BCD 4 Arm Middle Chainring - Silver - 32T (SJS Cycles part number 28750)
* Shimano Alivio FC-M430-8 64mm BCD 4 Arm Inner Chainring - Silver - 22T (SJS Cycles part number 28752)

Thank you!

I have a mountain bike with 175mm cranks and looking for much shorter cranks. It currently has a 122mm bottom bracket. Would this be a problem? If so would it be possible to install a 110mm bracket into the bike I have (old cannondale F4). My last resprt would be drilling the existing crank arms lol.

The min chainline for this crankset seems unusually outboard, is it designed for a touring triple or MTB triple?

I installed these cranks with a 110mm bottom bracket on my nephew's new Diamondback Line. I'm using a 32t narrow wide ring on the middle position. Chain line seems good but there is very little clearance between the chainring and the chainstay. What would be a recommended amount of clearance?

Using this crank with 2x setup on inner and middle, could I get an acceptable chain line to a Shimano 105 5800 rear hub with a 10 spd cassette?

Many Thanks.

Hi, I'm looking to buy a Marin Wildcat Trail 3 or 5. I would want to replace the cranks with 155 mm or 160's.

The WT 3 comes with 170 mm cranks Shimano FC-TY301, 42/32/22T. The WT 5 with 170 mm cranks, Marin Forged Alloy 1x10, Hollow Spindle, Steel Narrow-Wide 32Tchainring, 76mm BCD.

Would you be able to suggest alternative 155 or 160 mm cranks that would fit either bike please.

Thanks, Nick.

Shimano Saint SM-CR81 104mm BCD 4 Arm Single Chainring & Bash Guard - 40T
https://www.sjscycles.co.uk/chainrings/shimano-saint-smcr81-104mm-bcd-4-arm-single-chainring-bash-guard-40t/

Hey I have in my hands this crank along with a Shimano ZEE 104 BCD 34 tooth chainring, both just arrived in the post from you. I am surprised the find that the chainring does not fit onto the middle position of this crank... its not going to fit without removing a small amount of metal. It fits perfectly on the outer position.

I have an older 104 BCD crank and chainring here for comparison, and on that crank I can place the chainrings equally well on the middle or outer positions.

Is it expected that the middle position is ever so slightly smaller than the outer position on this crank?

Due to arthritic knee, I need to reduce the length of the crank arms from 170 to 160mm. Are other options/products available?

I was planning on using his crankset with a 113mm BB (I already have one so don’t want to make another purchase) and 30t narrow/wide chainring in the middle position. The chainring has a slight offset, so I am hoping the extra 1.5mm of BB length either side will not be a problem. Please could you confirm this?

I will the Chainrings from Shimano XT FC-T8000 change to
Thorn Crank, is this ok?
BCD 104/64 is the same.

MfG

Theo

Do you sell any road bike cranks around 135mm in length (for my young son)?

Hello !

I think the Q-Factor is 180mm in 165mm and with a 110mm bbun ? Is it exact ?

Thank you to the team ! :)

Hi. I have a SR suntour super power flow crankset. The crankarms are too long for my height and it is hurting my knees (I have prior knee injuries). I was wondering if these arms would fit onto my existing crankset. Thanks!

Still looking for a square taper crankset i can use with 22/34/44 chainrings in a long haul trucker (26"). My main problem is I cannot be sure what should be the chainline for the middle ring (47.5 or 50?). Would the 107 BB be too short for a 47.7 chainline?
Also - can you see any reason why the chainrings Alivio M430 (BCD outer and medium rings 104, inner 64) would not work with this crankset?
Many thanks!

I've got a Thorn Adventure circa 2002 from new, derailleur gears, hollowtech FC-M510 cranks. A small amount of play has developed between the spider and crank on one of them. Can you still get hollowtech M510 cranks or do you have to getv this one now ? The BB's are still good (UN52's) but these don't seem to be available now either, is the UN55 a direct replacement?

I have a Nomad MK2 with Rohloff. Can you tell me the BB length I would need for a 54mm chain line please? Sorry if this question has been answered before but I thought the 73mm BB shell on the Nomad may make a difference.

My daugther is 8 years old and she is 132cm tall. Wich cranklength should i use?
And is a singlespeed 30T (104bcd) a good option with a 12-27 or 11-32 9sp?

None

I want shorter cranks on my road bike (originally shimano gears). Would these be suitable with 30/42/52 chainrings and a BB UN26 (113)

cheers!
Jx

Will your MK2 triple give me the critical 54 mm chain line with a shimano Un 55 with 107 spindle if I use the outer position on the crank. I do not intend to use a chain guard

Thanks for your help

Mark fishler

What would be the Q factor (outside to outside) on a 107mm BB?

It is mentioned 107 is the minimum recommended with 1 ring in the middle position, is that due to frame clearance or some other reason?

Hello, I've read previous questions and responses on this but am still confused. You've written that the lowest (smallest?) chainline possible is 52mm using a 107mm BB in a 68mm BB shell. But is that 52mm counting on using one, two or three ring? I am building a 26" wheel bike for my son using a standard 135mm Deore rear hub and a 10 speed XT cassette. Does that info already decide what chainline I need?
I want to set up the bike with a single chainring, either a 28T on the 64 and bash on the 104, or a 30T on 104. Is this going to work properly? As you can probably tell, I'm using my son as a guinea pig for my first ever build!

Hi
I'm build thorn nomad mk2 with s&s. Just want to make sure that is this crankset compatible with the frame above and this chainring ? #11054s40

and also with one chainring bolts do I need to get for this set?

Thanks for help

Are these cranks compatible with 10 speed chain rings?
I'm guessing the distances between chain rings should be a bit smaller on 10 speed?

i am building up / assembling parts for a bike for my daughter. the frame is an on one inbred, bb spec = 68mm, English threaded . i guess i am looking for a 68 / 110 mm with a JIS square taper? am i on the right lines? looking for something lightweight + good value.
thanks

If a 110mm bracket is required to get a 54mm chainline, which lenght do i need to get a 50mm chainline?
thank you

And is it ok for 9 speed?

Thank you

I just bought a second hand 2006 Gary Fisher Tassajara to my son and I am thinking of getting shorter crankarms. Currently DEORE hollowtech II crankset is fitted. Do you see any compability problems (frame/cranks/current chainrings) with getting these crankarms, and a UN55 73 mm/107 mm BB (current chainline seems to be 50 mm). Also I might suggest for him to convert to 1*10 by getting a 10 speed 11 36 casett and a new shifter. Would then the Thorn reversible single chainring 32T be appropriate?

Do these cranks come with chainring bolts or not?
I'm matching them with #11054s36