Last of the 135mm Pompinos...

[ravenbait]

Actually, he's probably not. But I digress.

The Truvativ Elita ISIS that came with my Pompino has given up the ghost. The near side crank is no longer staying on: inspection indicates it is royally buggered and beyond hope. Technology has come on a ways in the 17... 18 (KOFF) years since I bought my lovely blue fixie, and I am bamboozled in my attempt to get him back on the road. As he's currently my main workhorse, I need a solution!

I think there's a 55mm chainline, which would suggest a Shimano FC-M1500 as an option, but that means going to hollowtech, I think, which would mean trying to find a bike shop to face the bottom bracket. Ugh. I live in the middle of nowhere. Also, I'm not sure about running a 9 speed chain on the 11 speed chainring, although I guess I could swap it out for a similar BCD chainring designed for fixies.

I also considered the SRAM Apex1, but that's a 44.5mm chainline, which I don't think will work.

Does anyone have any suggestions? I'd love to shove either another splined cartridge BB in there or even a square taper that will give me the correct chainline, but I'm struggling to find the parts. Is everyone using external bearings these days?

Sam

[LittleWheelsandBig]

https://yacf.co.uk/forum/index.php?topic=74838.msg1542791#msg1542791 might be helpful. It suggests 47mm.

https://www.paulcomp.com/shop/components/hubs/rear-hubs/fixed-word/ lists 51.6mm for their 135 hub.

https://www.lfgss.com/conversations/345049/ suggests up to 53.5mm for Surly 135 hubs.

Square taper cranks and BBs still exist, though 120+mm BBs are becoming rare.

[sojournermike]

https://yacf.co.uk/forum/index.php?topic=74838.msg1542791#msg1542791 might be helpful. It suggests 47mm.

https://www.paulcomp.com/shop/components/hubs/rear-hubs/fixed-word/ lists 51.6mm for their 135 hub.

https://www.lfgss.com/conversations/345049/ suggests up to 53.5mm for Surly 135 hubs.

Square taper cranks and BBs still exist, though 120+mm BBs are becoming rare.

These are lovely

https://www.condorcycles.com/products/campagnolo-pista-track-chainset?variant=36799661801622&wgu=281345_196673_16484143607438_926814969d&wgexpiry=1656190360&source=webgains&siteid=196673

Then you’ll also need one of these

https://www.probikekit.co.uk/bottom-bracket-cups-spares/campagnolo-record-pista-bottom-bracket-silver/10777323.html?affil=thggpsad&switchcurrency=GBP&shippingcountry=GB&variation=10777324&shoppingpid=DDUK_180118_&&thg_ppc_campaign=71700000090751006&gclid=EAIaIQobChMIj4Wv-5Xn9gIV4mDmCh2e_g70EAQYAyABEgL1gPD_BwE&gclsrc=aw.ds

Of course, the BB isn’t sealed so sunshine only:(


Alternatively, Spa should have some options

[ravenbait]

Thanks both!

Wobbly John tracked down a brand new Truvativ Elita ISIS minus the chainring on Ebay for me. So I've bought that, and I just need to find the relevant bottom bracket and a new chainring.

If I can get another 16 years out of it, I'll either need another bike because rust will have had its way, or I will be too old to be riding fixed gear as my main bike!

Sam

[exilefromkent]

When my chainset/ bottom bracket gave up the ghost on my pompino (stronglight and apparently made of cheese) I replaced it with this from SPA cycles

https://www.spacycles.co.uk/m8b0s109p4544/SPA-CYCLES-TD2-TA-Single-Chainset

It's been excellent and combined with a good quality shimano bottom bracket haasn't missed a beat.

[ravenbait]

When my chainset/ bottom bracket gave up the ghost on my pompino (stronglight and apparently made of cheese) I replaced it with this from SPA cycles

https://www.spacycles.co.uk/m8b0s109p4544/SPA-CYCLES-TD2-TA-Single-Chainset

It's been excellent and combined with a good quality shimano bottom bracket haasn't missed a beat.

Is yours a 135mm (Tigger's Mum's Bathroom Blue) or the later 120mm version?

Sam

[exilefromkent]

Sorry for the late reply, mine is the 120mm version. It's been excellent

[aidan.f]

I have a spa chainset. I did have to file down the backside of the chainside boss to clear the BB cups.