Custom chainrings

[BigG]

Does anyone still make custom chainrings at a reasonable price. I am looking for an odd number (45 teeth) for the middle ring of a half-step and granny.

[fossala]

I don't know what your BCD is but check out here.
www.spacycles.co.uk/products.php?plid=m2b34s113p0

[Brucey]

TA make quite a good selection, and Parker Mail order hold reasonable stocks of 130, 135mm BCD ones e.g.

http://www.parker-international.co.uk/9309/TA-130pcd-Alize-Shimano-8-9-10-Chainring.html

including a 45T inner. They ain't cheap, but they are cheaper than a custom jobbie by far.

cheers

[BigG]

Thanks for the help. However, I shouldhave mentioned that I am looking for 5 arm 94 mm bcd rings for compact chainsets. I don't think that these were ever available in odd no. sizes. They are readily available with 130 mm bcd but this does not allow a small enough inner ring for me. TA Cyclotouriste likewise.

[Brucey]

I think that it might be most cost-effective to buy a different chainset for which you can buy suitable rings, rather than to have custom rings made.

cheers

[BigG]

I can only get down to 24 teth on the inner ring that way. I was hoping for 22 or 20 tooth inner but this limits me to an old compact drive chainset or its Suntour equivalent. Neither of these have 45 tooth rings available. I may have to compromise.

[Mick F]

You want a 22 inner, a 45 middle, and what on the outer?
What have you got at the back?

Is there another combination which would give you what you want?

[Brucey]

some early '90s campag MTB chainsets (one of the ones with a silly name I expect, now as rare as hen's teeth) had 110bcd outer rings and an inner ring fitting that accepted a cassette sprocket. There may have been one or two others of similar ilk, too.

IIRC there is/was an inner ring that you could buy that would turn a double into a triple that would work the same way also.

If you can lay your hands on one of those it might do the trick.

Worth checking velobase for suitable cranksets.

The advantage of this scheme is that the sprockets-as-chainrings are very hard-wearing in comparison to conventional chainrings. Even steel chainrings are not usually made of hardened steel, but all sprockets are.

cheers

[[XAP]Bob]

And an 11 tooth chainring would pull you up, well, anything....

[Brucey]

this is one of the sort I was thinking of;



Campagnolo FC-01CSIC, 'Icarus'

more here;
http://www.velobase.com/ViewComponent.aspx?ID=EDF9ECDC-0C6B-4987-B174-F3CB6569E386&Enum=115&AbsPos=31

for your purposes, fitting the middle ring to the outer ring BCD with long bolts and spacers, and fitting the inner ring (sprocket) with suitable spacers would do the trick.

Please do check that the outer ring is 110BCD though; I have not verified this for myself.

cheers

[fossala]

That's a nice chainset.

[BigG]

this is one of the sort I was thinking of;



Campagnolo FC-01CSIC, 'Icarus'

more here;
http://www.velobase.com/ViewComponent.aspx?ID=EDF9ECDC-0C6B-4987-B174-F3CB6569E386&Enum=115&AbsPos=31

for your purposes, fitting the middle ring to the outer ring BCD with long bolts and spacers, and fitting the inner ring (sprocket) with suitable spacers would do the trick.

Please do check that the outer ring is 110BCD though; I have not verified this for myself.

cheers

Thank you. I have a vague recollection of Campagnolo selling a triple using a cassette sprocket for the inner. I will try to locate one. I think that TA used to make a triple with 130/74 mm bcd rings. This is proving hard to find.

[Brucey]

as I mentioned before, I think there is another chainset or adaptor...? (a French one?) that also uses a cassette sprocket type fitting for the inner chainring. Dashed if I can remember the details though....

edit; or like this, but with 45T?

http://store.interlocracing.com/cotrch.html

cheers

[BigG]

As luck would have it, I have just found a 43 tooth 94 mm bcd ring on ebay - after several weeks of looking! A 48/43 pairing will suit me as well as a 50/45 as it is the gap between the rings that matters with a half step. I doubt that I will notice the small change in overall gearing. A top gear of 92.6 instead of 96.4 is quite enough for me at my advanced age. I like nothing better than freewheeling. Thanks again for the suggestions.