Wheelbuilding / Wheel Building / Wheel build help

If my rear spacing is 132.5mm...

My first thought is the frame may be bent. Use Sheldon's technique to check whether it's evenly bent. Look carefully at whether the dropouts are parallel to try and guess whether it's been bent in or out.

^ It's probably a new (cyclocross?) frame which is designed to take either 130 or 135, and therefore intentionally has 132.5 spacing.

moth - rear spacing is defo 132.5mm It's in the manufacturer's frame spec. It's no cyclocross bike but it does fall somewhere between road and touring. I guess it's that way to give the rider more choice.

ok. New one on me.

135 - slightly less dished and therefore stronger wheel.

130 - can be spaced out to 132.5 so the dropouts will be perfectly parallel, avoiding that minor cause of stress on the cones and axles.

ok. New one on me

Weren't the first generation Pompinos built in an in-between spacing to accommodate either road or MTB hubs?

Given the choice, 135mm is preferred as moving the DS flange 2.5mm to the right makes a big difference to the spoke bracing angle on that, weak, side

I think they were offered in both 135 and 120 spacing IIRC.

I'm looking for a set of cheap rims for my campus bike. 700c, with brakes. How cheap is too cheap? Eg, are these going to kill me? 'Cause a fiver for a rim seems worryingly cheap.

They're not £5 rims though, are they? They're £15 Rigidas on clearance. Buy with confidence.

Good point. I always take CRC retail prices with a pinch of salt.

A spoke came completely loose today on cycle in to work. I just stripped off the tyre, tube and tape (nothing exciting there) and reattached the loose spoke with my new spoke key. Go me. Then worked out by plucking the spokes that the tension between them was all fubar'd, so have made them all equals, by sound anyway.

Question: I'm happy the tension is now equal-ish between all the spokes, how I know the tension I the initial spoke I chose was right in the first place?

See this discussion for the resonant frequency calculation, since you have tuned your wheel rather than truing it.

The range of spoke tensions over which your wheel will work satisfactorily will depend on the build, of both the wheel and you. We discussed up thread (page 8) how this range is quite wide for light riders on many-spoked wheels and quite narrow for heavy riders with low spoke counts.

Thanks, very much appreciated!

I need to replace a now discontinued Velocity Aerohead Rim for a track wheel, ideally like for like ERD (602) so I can reuse the existing spokes and, for which spocalc lists the following rims, many of which don't appear in shopping searches on google.

                            Sun M19AII (632 mm OD)
                           Araya ADX-2W                             

Ritchey Aero Road WCS OCR (ERD is nipple contact dia + 3mm for nipples)
Velocity Escape 19mm x 19mm
Ritchey Aero Road Comp centered holes (ERD is nipple contact dia + 3mm for nipples)
Ritchey Aero Road WCS centered holes (ERD is nipple contact dia + 3mm for nipples)
Campagnolo Seoul '88

                    Mavic Open 20D                                Mavic Open 20   
                         Ritchey Aero Road Pro centered holes (ERD is nipple contact dia + 3mm for nipples)                              

Ritchey Aero Road Pro OCR (ERD is nipple contact dia + 3mm for nipples)
Wolber TX Profil aero
Velocity Aerohead (20mm wide x 19mm deep, 2001)

  Rigida CHP-6                              

Ritchey Aero Road Comp OCR (ERD is nipple contact dia + 3mm for nipples)

How much tolerance on ERD would there be.. I.e. could I go as low as 600, high as 604 to increas my options without needing new spokes?

Note - playing with Spocalc a 2mm change in ERD seems to equate to about 1mm in spoke length... so I'm thinking it should be doable?

How much tolerance on ERD would there be.. I.e. could I go as low as 600, high as 604 to increas my options without needing new spokes?

If the spokes are exactly the right length now, you can go up by 2mm on the ERD without problem, but you can't go down. If you can see threads on the spokes where they enter the nipple, you can go down 2mm on the ERD, but not up.

ACI db spokes are only 21p, about £10 per wheel with postage, so bear that in mind when rim shopping.

I need to replace a now discontinued Velocity Aerohead Rim for a track wheel, ideally like for like ERD (602)

Sure it's discontinued? The Velocity website seems to have it available in a number of versions (eg http://store.velocityusa.com/p/aerohead-700c-nonmsw?pp=12&pp=12), though to be fair I didn't look for a UK supplier.

Various sources suggest that an Open Pro has an ERD between 602 and 605mm, with at least one claiming to have measured it at 603mm - this would be more than close enough to work fine. (And a Rigida Chrina is a straight swap for an Open Pro, and a lot cheaper ...)

Rigida Chrina is a straight swap for an Open Sport, and a bit cheaper ...)

ftfy

(And a Rigida Chrina is a straight swap for an Open Sport, and a bit cheaper ...)

ftfy

Same source as claims to have measured Open Pro as 603mm claims to have measured Chrina as 603.5mm.

Swap worked for me anyway ...

(And yes, I believe it works well enough on an Open Sport too.)

I wasn't commenting on the ERD match, just the design of the rims.

Cheers both. 603 was the value I used for my Open Pro build.

It's the 32h Non Machined version I'm after, and my LBS has to go via BLB who say it's discontinued, the link you give is for 36h NM only.

Threads aren't showing, so I guess I can go up to 604 on the ERD from what you say.

Cheers.

I wasn't commenting on the ERD match, just the design of the rims.

Profile on the Chrina is midway between the Open Pro and Sport I reckon, and it's double-eyeletted, which of course the Sport isn't ... Not that it matters anyway

It's the 32h Non Machined version I'm after, and my LBS has to go via BLB who say it's discontinued, the link you give is for 36h NM only.

Fair enough - I just picked a random link on the shopping site. Looks like you could get 32h in Bubblegum Pink though.

(Plus postage from the USA. And duty. And VAT. You'd have to really want it ...)

If I were in rhb's shoes, I'd be very tempted to snap up a pair of these Araya DRX6000s while they're under £5 each, buy new ACI spokes for both wheels, total spend under £30.

Yeah, just found those before looking back here. Can't find much info on them, but at that price gotta be a bargain?

P.s. a pair on their way, ta.

DRX6000 are Jalco rims, CRC are bad with listings alot of the time. Rim height 25mm, inner width 14mm, outer width 19mm, weight 505g
no eyelets, groove in braking surface like 'mavic open sport'