Search found 760 matches

by UpWrong
10 Jan 2020, 9:58pm
Forum: Non-standard, Human Powered Vehicles
Topic: Road compact doubles on 'bents - what shifter?
Replies: 13
Views: 408

Re: Road compact doubles on 'bents - what shifter?

Ive recently built a Gaucho 28 tour with open cockpit steering. Ive used a compact double (48/34) with SLX shifters mounted under the bars (you can just make them out in the image) the front changer is a Tiagra double and the left shifter a triple. So far seems to work fine. Nice bike, nice build :...
by UpWrong
10 Jan 2020, 9:49pm
Forum: Non-standard, Human Powered Vehicles
Topic: Road compact doubles on 'bents - what shifter?
Replies: 13
Views: 408

Re: Road compact doubles on 'bents - what shifter?

OldBloke wrote:Check out Microshift https://www.microshift.com/en/product-category/road/road-shifters/page/2/, they have some road options that might suit your situation.

OB

I couldn't find any UK sellers of these to find out prices. Thanks anyway.
by UpWrong
5 Jan 2020, 10:28pm
Forum: Non-standard, Human Powered Vehicles
Topic: Road compact doubles on 'bents - what shifter?
Replies: 13
Views: 408

Re: Road compact doubles on 'bents - what shifter?

Ah, looks like Shimano make the SL rapidfire shifters to work with road FDs. I could presumably use the Tiagra SL-4603 triple shifter with the Sora double FD: https://www.sjscycles.co.uk/gear-shifters/shimano-tiagra-sl4603-10-speed-rapidfire-shift-lever-for-flat-bar-triple-left-hand/
by UpWrong
5 Jan 2020, 8:51pm
Forum: Non-standard, Human Powered Vehicles
Topic: Road compact doubles on 'bents - what shifter?
Replies: 13
Views: 408

Re: Road compact doubles on 'bents - what shifter?

[XAP]Bob wrote:I would have thought that a thumbie should be operable without steering


I think you are right, if I mount the thumbie underneath the grip, to be operated by my thumb :lol:

It seems you can't get mtn double FDs that can handle a 33/48 double.
by UpWrong
5 Jan 2020, 6:18pm
Forum: Non-standard, Human Powered Vehicles
Topic: Road compact doubles on 'bents - what shifter?
Replies: 13
Views: 408

Re: Road compact doubles on 'bents - what shifter?

Open Cockbit bars.

Maybe I should look for an MTB double FD that works with 33/48 rings, if there is such a thing.
by UpWrong
5 Jan 2020, 3:09pm
Forum: Non-standard, Human Powered Vehicles
Topic: Road compact doubles on 'bents - what shifter?
Replies: 13
Views: 408

Road compact doubles on 'bents - what shifter?

So I have a 33/48 road compact double (Stronglight Junior) on the Paseo and a Sora FD to match it. Gear change with the SRAM MRX twist grip was straining my arm so switched to a Dore triple LH trigger shifter. Aargh, forget that the cable pull isn't the right match for a road FD. Have to have a slac...
by UpWrong
4 Jan 2020, 1:06pm
Forum: Non-standard, Human Powered Vehicles
Topic: Rear suspension forces analysis
Replies: 10
Views: 295

Re: Rear suspension forces analysis

Thanks Brucey. That's a concise description of suspension squat and rise with a single pivot point (force number 1 in my list). Sounds like tyre to ground reaction force will have no effect of suspension compression or extension in itself. I'm still trying to work out if the deflection force on the ...
by UpWrong
4 Jan 2020, 12:14pm
Forum: Non-standard, Human Powered Vehicles
Topic: Rear suspension forces analysis
Replies: 10
Views: 295

Re: Rear suspension forces analysis

There will be negligible tension between the hub and the idler (unless your idler is on the power side?) The primary chain tension is forward from the sprockets, which is designed to create a torque in the rear wheel. It will also pull the whole wheel forward, but that is resisted by the compressio...
by UpWrong
4 Jan 2020, 11:06am
Forum: Non-standard, Human Powered Vehicles
Topic: Rear suspension forces analysis
Replies: 10
Views: 295

Rear suspension forces analysis

I posted this on a rather old Bentrideronline thread, but would be interested in any comments here. Assuming single pivot design and a single idler, I think these are the 3 main forces at work: ⋅ chain pulling the rear hub towards the idler ⋅ reaction force of tyre on the road &s...
by UpWrong
29 Dec 2019, 4:06pm
Forum: Non-standard, Human Powered Vehicles
Topic: 1x11 gearing on a bent
Replies: 51
Views: 17075

Re: 1x11 gearing on a bent

I have made up a 13-40T 10 speed cassette with XT RD mounted on a Wolf tooth goat link and XT shifter. Cabling and gear adjustment was very easy.
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by UpWrong
27 Dec 2019, 12:04pm
Forum: Non-standard, Human Powered Vehicles
Topic: In for a penny - trike vs velomobile
Replies: 30
Views: 1575

Re: In for a penny - trike vs velomobile

The Quattrovelo uses a double freewheel design rather than a differential.
by UpWrong
8 Dec 2019, 10:47am
Forum: Non-standard, Human Powered Vehicles
Topic: In for a penny - trike vs velomobile
Replies: 30
Views: 1575

Re: In for a penny - trike vs velomobile

I've been considering a trike with full suspension, and I love the weather protection of a full fairing so likewise the thought is, why not go the whole hog and buy a velomobile. It could possibly sit on the driveway or in the front garden with a ground anchor to secure it. OTOH there's the cost and...
by UpWrong
3 Nov 2019, 11:16am
Forum: Bikes & Bits – Technical section
Topic: Recumbent trike, 20” tyre suggestions please
Replies: 6
Views: 299

Re: Recumbent trike, 20” tyre suggestions please

If you want good punct*re protection and a good width at a reasonable price then 40mm Marathon greenguard is hard to beat. Perhaps, but if the design of the 20" (406?) tyre is like the 622 then the best compromise for on-road use is probably the 37mm See:- https://www.bicyclerollingresistance....