Billy007 wrote: think the 44T or 46T would give you the higher gearing you are seeking but still be stiff enough on your 104 BCD 4 arm crank. I feel a 48T front chain ring is too big.
For chain covers may be you could look at something else which maybe wider allowing you to use it with the Thorn chain ring such as a Pashley or a Raleigh cover or maybe go onto a few German websites as they produce a lot more very good utility bikes than we do in the UK? Just suggestions. Yes it does seem strange that the Hebie Chainglider is quite narrow.
Thanks for your reply. You have given me a lot to think about. I am very tempted to try the 48T thorn and pick up one of these BMX rings in 46T:https://specialites-ta.com/bmx/330-1538 ... ure,46-dts
I have emailed them regarding the BMX ring to ask how thick it is, but I suspect it will be thinner than the Thorn. I have personally never seen anything as thick as the Thorn. Also, I think If I want stuff from Europe, it's probably a good time to buy in now, just in case they start charging import duty after Brexit.
As for other Chain covers, I had a look at the Pashley, Hesling and a few for dutch bikes, but many of them look a real pain to fit, with no guarantees that they would fit my bike. The Hebie looks like the most straight forward option. One thing I meant to ask is, how much extra thickness to the chainring does the Hebie add after it is fitted? I ask this as I have a bottle holder on the downtube and need to measure up to see if everything still fits when the Hebie is fitted. I also like using Gopro mounts in strange places, so very interested to discover how much extra space the Hebie takes up?
Hi Tommy, I just measured the chainwheel I replaced my Thorn one with, the steel ebay one I mentioned earlier, it is 2.5mm thick all over. I originally ran my chainglider with the Thorn chainring and it was indeed a bit draggy, but not particularly noticeable once underway, the thicker part of the Thorn ring is 5mm where the glider rubs. I can't say it bothered me that much whilst pedalling, it does some other people from what I read.https://www.ebay.co.uk/itm/PB-Single-Sp ... 3b53fbe725
One sided and available up to 46teeth.
I'd ordered the one from ebay anyway and when it arrived fitted it, it gives about 1.5mm clearance from the chainglider sides in total,
initially I was disappointed to find that the side of the chainwheel still rubs lightly on the chainglider, as it skates/floats across the top of the chain when pedalling, I can notice this turning the pedal by hand, not so much whilst riding. I still have the Thorn one as a spare and would probably fit it with chainglider when I wear this one out . I've pressed the chainglider from the rear to show the clearance with the replacement ring, it normally sits rubbing lightly against the outer face of the chain ring whilst pedalling.
I think there may be a case to be made for using the Thorn ring with a chainglider as you can see the chain links in the gap between the thin replacement ring and the glider ( picture), the Thorn ring would effectively seal off that gap and keep a bit more weather out, but the drag business might bother you more than it did me. A long mudflap keeps a bit more at bay.It only rubs on about a 2mm deep strip, you can just see the witness mark here(picture).
The chainglider is 14mm wide over the chain ring and a similar distance horizontally from the line of the bottle cage (picture), if that's the information you were after.
I bought this bike second hand and gave the the transmission a bit of a birthday whist I was still keen ! All this what fits with what stuff is a bit of a headache isn't it ? Worth putting the effort in to get it how it suits you though.https://www.ebay.co.uk/itm/PB-Single-Sp ... 3b53fbe725