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Echo SL 108 Screw On

Product code: 10864


In stock

Echo SL 108 Screw On

- Echo's reliable SL 108 point 9-pawl freewheel - our most popular selling freewheel!
- Special spring system ensures accurate and positive engagement, and also makes the freewheel very loud.
- These nine high quality heat treated steel pawls are offset into groups of three into a tough 36 tooth ratchet, giving great pedal response. (See additional info for view of inside the freewheel - please note the freewheel is not supplied open like this! The photo is just for illustrative purposes.)
- Another great feature of the freewheel is the location of the bearing preload lockring. This is situated against the crank arm to prevent it from coming loose.
- The lockring also tightens down against a set of shims, this has two benefits: It ensures correct bearing preload and stops the lockring from tightening over time and damaging the bearings.
- 4 large removal pockets are also set into the other side of the freewheel: these do not stick out like tabs, which allows shorter bottom brackets to be run, and therefore better chain lines and increased chain life.
- 1.37" x 24tpi thread fits almost all hubs and cranks.
- Also compatible with the SKF Bottom Brackets.
- Only available in Black (additional photo of silver freewheel is just to show the internals).
- 18t only.
- Weight: 175g

Overall Thickness: 17.07mm

Additional Information

Also compatible with SKF bottom brackets, however you may not be able to run a bashring with this setup - please contact us if you are unsure.

Can be used on the rear as long as you have a hub with standard 1.37" x 24 tpi thread.

Always ensure the lockring is kept tight, failure to do so may limit chances of any warranty replacement being issued. If you need help with how to do this then just give us a call.

These freewheels may appear to 'rattle' from new - this is down to the bearing system. It would be possible to add an extra bearing in and stop the rattle, however this would then cause the freewheel to lock up!

Can be removed with this tool, you do not need the specific Echo tool however it does fit a little better.

Freewheel sound level:

All freewheels tested under similar conditions. Please note that the sound level of a freewheel may change after bedding in. A 10 dB increase in sound level is approximately equivalent to double the perceived volume.


민호 전

Is there any problem in front mounting this freewheel?

Posted by 민호 전

Reply from TartyBikes

Hello - This freewheel is designed to be used on the crank arm so that should be no problem at all. Thanks, Mark


Hey just enquiring if this is an 18t freewheel

Posted by Ty

Reply from TartyBikes

Hi Ty - That's correct, I'll update the description now. Thanks, Mark


i have this freewheel on my new bike and was unaware of the bed in process, now two mounths later i broke a pawl seizing the freewheel. I opened it up and removed the broken bits, put it back together and am riding. How reliable do you think it will be?

Posted by Travis

Reply from TartyBikes

Hi Travis - we would not advise riding a freewheel with missing pawls. We have spare springs and pawls for these freewheels in stock which you can use to repair it. Hope that helps. Thanks, Flipp.


What size chain does this freewheel use?

Posted by Scorpio

Reply from TartyBikes

Hi Scorpio - this freewheel will work with both 3/32" and 1/8" chains. Hope that helps. Thanks, Flipp.


Hi TB, would like to know if it will fit the onza comp 2014 with standart crankset. Thanks

Posted by Vlad

Reply from TartyBikes

Hi Vlad - this will fit your cranks just fine! Thanks, Flipp.

Alex Clare

If I were to have this freewheel, which rear sprocket would you advise for a Trialtech sport lite rear 26"

Posted by Alex Clare

Reply from TartyBikes

Hi Alex - thanks for your question. If you were looking just at standard sprockets then we'd recommend the Echo TR or Trialtech in 15t, though there are titanium or aluminium alternatives if you are looking to save weight. Hope that helps. Thanks, Flipp.


can these be disassembled for maintenance? the pictures seem to imply this, though it seems like 2 different freewheels

Posted by vince

Reply from TartyBikes

Hi Vince - thanks for your question. Yes, these freewheels can be opened for maintenance. The picture of the opened one looks different only because it is silver. Echo changed them from silver to black, but they were otherwise exactly the same so we didn't take a new picture of that. Hope that helps. Thanks, Flipp.

ennio amodio

Hi Tarty, does it fits Koxx 549? Thank you

Posted by ennio amodio

Reply from TartyBikes

Hi Ennio - yes, this will fit your bike. It is an 18 tooth freewheel though, so if you are still using a freewheel on the rear, it might be worth checking if that is correct (we are not too familiar with that bike). If you require a 16 tooth freewheel as is more usual for the rear, we have several options. Thanks, Flipp.

Jacob Soper

Hi there, i was wondering what the pickup delay is like on the SL 108? as i'm looking at getting it for my cycle speedway bike and the shorter the delay the better! thanks a lot. jacob

Posted by Jacob Soper

Reply from TartyBikes

Hi Jacob - these freewheels have 108 engagements per revolution, meaning one engagement per 3.3. Thanks, Flipp.


Do i need to bed the freewheel in when i get it and if so, for how long.?

Posted by Iain

Reply from TartyBikes

You shouldn't need to, as it's not full of grease. Regards, Adam


will this freewheel fit onto te onza zoot cranks? i have a trial tech sport BB...

Posted by matt

Reply from TartyBikes

Hi Matt - This freewheel should fit onto the Zoot cranks with no problems. If it doesn't seem to fit, it may be worth checking if the brass (gold coloured) threaded insert for the cranks has stayed on the inside of your old freewheel instead of remaining on the crank itself. If it has, apply some threadlock to the threads on the crank arm, then tighten your old freewheel with insert back onto the crank. Once the threadlock has dried, remove the freewheel again and this time it should leave the insert on the crank. Thanks, Mark


hi were can i get the tool that removes this freewheel from my rear hub ?

Posted by jack

Reply from TartyBikes

Hi Jack - The Cyclo Freewheel Remover Tool (Quick find code: 010755) works fine to remove these freewheels from both hubs and cranks. Thanks, Mark


could i use this freewheel for normal single speed riding? just to take advantage of points of engagement and overall badassy-ness?

Posted by matthew

Reply from TartyBikes

Hi Matthew - Plenty of people do! We have a few customers who ride cycle speedway, do BMX racing and a bunch of other single-speed-based disciplines who all run this freewheel, so it seems well suited to all types of riding, really. Thanks, Mark

Dean Lawless

hi i need some advice for servicing and keeping high maintenance on this free wheel. got any tips? thanks.

Posted by Dean Lawless

Reply from TartyBikes

Hi Dean - SLs are relatively maintenance free, but adding a little lubricant (such as thin chain oil) from time to time can help keep them running at their best. You don't need to strip the freewheel to do this - holding the freewheel/crank assembly on it's side then dribbling it through the gap between the outer shell and the freewheel core works fine. If you spin it whilst doing this it should work into the freewheel nicely. Thanks, Mark


Is there a guide on how to mount a FFW?

Posted by Thomas

Reply from TartyBikes

Hi Thomas - We have a video guide in our Product Video Guide section for removing a freewheel. To install a freewheel, you simply need to grease the threads of the crank/freewheel, then screw the freewheel on by hand. If you then gently pedal your bike this will tighten the freewheel on fully. Thanks, Mark


can i get one that is 18 tooth?

Posted by Tom

Reply from TartyBikes

Hi Tom - These are only available in 18t. Thanks, Mark


Is there any difference to putting the freewheel on the crank or rear hub, advantages over one another?

Posted by Mike

Reply from TartyBikes

Hi Mike - The main benefits of a front freewheel (FFW) setup are that it centralises the weight of your bike (instead of having a heavier rear wheel), it's lighter, and it's smaller which gives better clearance. Generally speaking it also works out cheaper, as an 18t freewheel and bashring with a 12t or 15t sprocket - depending on your wheel size - will work out costing less than buying a larger screw-on sprocket for the front with the appropriate sized bashring. Thanks, Mark

Ben Mortimer

How loud are these freewheels about as loud as a pro 2 trials?

Posted by Ben Mortimer

Reply from TartyBikes

Hi, Yes they are pretty loud, definitely the loudest freewheel we sell. Thanks, Adam


Write a review


Based on 8 customer ratings


Good and Bad

Posted by Taylor

Great freewheel, the loudest one I have personaly owned. However, Im not sure if i got a bad one or maybe I didnt bed it in as thorough or as well as I could have but afer 2 months it started to skip engagements alot. I flushed it out with some GT85 to see if it might help but realised there was several things rattling around inside of it. I opened it up to see and there was a few little stones and grissles in it. I flushed it again but when It still seems to skip alot, I decided to soak it in a small bowl of petrol with cling film over it for a week or so and bought a White Industries ENO Trials which is a GREAT freewheel, the best I have ever owned, It hasnt skipped once and sounds so smooth. Going back to the Echo SL, after soaking it I put it back on my Crank arm but I decided to bed it in again while flushing it with GT85 for about 15 mins, I havn't had any problems with it since. It has gone a funny coppery colour but it looks nice. I would Recommend it to anyone. GREAT SOUND! GREAT ENGAGEMENT! GREAT PRICE! If you can save that little extra, The White Industries ENO Trials. It Rocks.

Reply from TartyBikes

Hi Taylor - It's normal for the Echo SL freewheel to rattle a little, as the description mentions. However, if you've found dirt/little stones inside there that definitely won't be helping! As it's an open system the SL is more prone to having any debris/dirt entering the engagement mechanism if you ride in any muddy/sandy/wet areas, although stripping the freewheel should usually make them as good as new. Thanks for the review!



Posted by Maciej

Been using this freewheel for a week now and I'm already amazed how good it is. Sprayed some GT-85 to speed up the bedding in process, this freewheel has really good engagement and sound, would recommend to anybody, great freewheel.

Reply from TartyBikes

Hi Maciej - These are great freewheels, we're all big fans of them here! Thanks for the review.


good for price

Posted by martin

The first four months of using this freewheel it was spot on then with out warning a pawl snapped and locked the freewheel up , tarty repaired it with no worries :) then two weeks after another pawl snapped and locked it up again again tarty repaired it with no hassle :) , but it skips now and then Tarty bikes service has been excellent :) The freewheel I'm now cautious with.

Reply from TartyBikes

Hi Martin - I'm sorry to hear you've had so many problems with your freewheel. We've seen instances of pawls breaking in these freewheels before, but to get two breaking so soon after each other is pretty rare! Thanks for the review.



Posted by Mark

Absolutely amazing! 110%. I recommend running this freewheel in first, no trials, just ride it like a normal bike and then you will have the best freewheel in the world!!!!


The new series

Posted by Tamás

The new serires of this freewheel is interesting. After 2 months my new freewheel skipped more times and has strange sound. One of my friends had an Echo SL freewheel. It broke in half inside after 3 months. Another one of my friends had an Echo SL freewheel too. It became fix after 1 month.

Reply from TartyBikes

Hi Tamas - It's strange you've had this many problems with freewheels! The SL is our most popular freewheel and we haven't heard of many having problems. The problems we have heard of have usually come from someone riding in the wet/mud with their freewheel then not lubricating it afterwards. The SL freewheels have very little lubricant as standard, so if you ride in the wet then they can often become a little rusty/rough to use. If you use either some spray lube or thin chain oil to lube your freewheel then this will often stop any problems that might occur. There's also no 'new series' of Echo SL 108 freewheel - the only change came about when they altered the extractor tabs from the 8-prong to the 4-slot system, but that was quite some time ago and there was no difference to the 'workings' of the freewheel. Thanks, Mark


Great freewheel.

Posted by Cai

Mine has not skipped once since buying it 9 months ago. The number of engagements are spot on too. However it doesn't feel as stiff as the Tensile or Monty freewheels that I've owned before this, so there's still room for Echo to improve here!

Reply from TartyBikes

Hi - A stiff feeling freewheel usually means something isn't quite right, so the fact that the Echo runs smoothly is definitely a good thing!



Posted by Shane

Cheap and very very good, even better engagement when on the cranks, would recommend to anyone!


Excellent product

Posted by Frank

This freewheel is the only one to have, worth every penny. It will not skip and has more than enough engagements. Excellent quality and reasonably priced!

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